I've been around the tech industry since the mid-1990's so when Bitcoin first started to gain a little traction I had a lot of tech friends who would try to evangelize to me about it. Some of them have gone on to write books and are regular conference speakers on Bitcoin.
In the early days all anyone ever talked about was that Bitcoin was going to replace fiat currency. Central banks were evil. JP Morgan was evil incarnate (Jamie Dimon was the devil himself). Inflation! Wheel barrows full of money to buy a loaf of bread. Illuminati!
The original Bitcoin zealots I knew were banking (no pun intended) on a total collapse of society and banking systems as one of their selling points. They sounded like the same people who for the last XXX years have been saying that you need to stockpile gold and firearms for the coming apocalypse. In fact, many framed their "pitch" that they would be in gold but gold is too heavy to transport and too difficult to store so Bitcoin was really the only answer.
But the thing that really made me skeptical was the fact that they couldn't (and still can't) address simple questions without becoming highly agitated.
For instance, given the proof of work concept used to verify transactions, there was an inherent limit built into Bitcoin that would preclude it from ever becoming a high transaction currency. How could it ever replace fiat currency if in an entire day it can't even handle the number of transactions Visa processes in an hour?
And this is now becoming problematic as it takes a half hour or more for a transaction to clear. How can you walk into a Starbucks and pay for a coffee when merchants have to wait for the money to clear? Especially when the price of that coffee could fluctuate several dollars during that waiting period?
Someone told me the other day that that is not a real worry because cryptos have a tendency to lose volatility the longer they have been around and the greater the acceptance. Really? Because Bitcoin is the grandaddy of cryptos (and most widely owned) and Bitcoin is anything but stable in price.
And who would want paid in Bitcoin if they got their pay on Friday and it was worth 20% less on Monday because some Bitcoin miner in China had a security breach driving down the value of Bitcoin? If my labor is worth $100 on Friday, I want it to buy the same amount of goods and services on Monday morning. There simply won't be any widespread adoption of Bitcoin as a replacement for fiat currency until the volatility declines to that approaching fiat currencies.
Nobody cares about libertarian political philosophies like decentralization and peer-to-peer payments when they can't afford to buy groceries this week because the value of Bitcoin is moved 20% in 2 days.
But now when you bring up these points, the very same people who invested in Bitcoin back in the early days and are sitting on (in some cases) millions in profits claim that the chances of Bitcoin replacing fiat are pretty low. Now they say Bitcoin is more of a store of value, not a currency. They now freely admit the transaction throughput flaws I pointed out when Bitcoin was in its infancy. Hmmmm . . .
So if Bitcoin is not a currency and is now a store of value, what is backing the value of Bitcoin?
"The blockchain!!!!!!!!!" they scream.
But the blockchain is open source and anyone can start a blockchain-based crypto currency. What happens to Bitcoin if Visa adopts a blockchain based on Visa Bucks? Since it would not be decentralized and would not necessarily need proof of work they could process high transaction volumes. How does that make Bitcoin any more or less valuable (well, less valuable is easy to picture but it doesn't make it more valuable).
Then they say, "Well, that's why I'm investing in other crypto currencies like ETH". Ahhh, so you see the flaw in Bitcoin and you're jumping onto the newest fad?
Don't get me wrong, I think there's a genius behind the blockchain. I do think that it will find its way into our day to day lives at some point. But Bitcoin is not the blockchain. You're not investing in blockchain technologies buying Bitcoin.
The thing that scares me the most about Bitcoin and other crypto currencies is that it's like debating a college student that's just finished reading Karl Marx. Facts, real world results, and human nature can't sway them because their understanding doesn't go any deeper than buzzwords and a conviction that if the whole world just thought like them then all the world's problems would be easily solved.
They jump around definitions back and forth like Bitcoin being a currency and a store of value based on which side of their statement has just been questioned. All problems like transaction volume, or what incentives miners will have to keep validating transactions after all 21 million bitcoin are mined, will magically be solved in the future but the details on how are intentionally fuzzy because nobody actually knows and even a hypothetical answer relies on hypothetical future advancements in technology.
In the end, their final rebuttal will always be, "You just don't get it."
Also, some things to think about.
According to AQR Capital Management, 1,000 people own 40% of all Bitcoins. Seems you would only need to coordinate a relatively small number of people to drive up or down the price of Bitcoin. So much for decentralization.
I've seen similar analysis that indicates that Chinese own 10 million Bitcoins which represents about 2/3 of all Bitcoins currently in existence. If China were to ban Bitcoin and-or Bitcoin mining, think about the impact.
Currently, Bitcoin mining is estimated to consume more power than is used in the entire country of Ireland per year. This is one of the reasons so much Bitcoin mining is concentrated in China. The cost of energy is heavily subsidized. It's also one of the reasons why China might have a problem with continuing to allow Bitcoin miners to operate from China. That's not even considering the environmental impact if Bitcoin ever became widespread.
It's estimated that 4.4 billion people (50 million in the US alone) don't have access to the internet. Sort of hard for Bitcoin to replace fiat currency when over half the earth's population doesn't even have access to the internet.