Technically, you can calculate annual appreciation based on past data and metrics, but there are also many other variables/factors to account for that would make it nearly impossible to accurately predict how your portfolio would perfrom 5, 10, 20 years down the line.

Is plan B Bitcoin and stocks or just biting the bullet and buying back in at an even higher price which might very well be “today’s bubble” just 15 years after it was predicted back in 2010. 

Predicting those things are probably more guesses than insight.We're probably biased some being too close to the industry than some others.Also Bubble probably shouldn't matter to Long Term Investors. 

I predict a lot of lawsuits coming out of this Subject To mainia.

Buying another property within the next few years may be even more expensive if some predictions about lower interest rates come to fruition.

Below is my theory/prediction on this topic -As per fed's notes from last meeting, there is one more rate hike this year which will be bring fed-fund rate to 5.25-5.5% (probably in Sep and not Nov).

You want it to be predictable and successful, right?

We are going to see many more of these is my prediction. 

The UN’s prediction is our population GROWTH will slow in about 50 years but it will continue, and in 80 years we’ll only have 60 million more people than today.

Return calculations only predict how a property is likely to perform on day one under ideal conditions.