Too big to fail: Do more rental units make more likely to survive

[Johnoson Crutchfield]

I've playing with a few calculators, as I prepare for the next potential downturn. I am a buy and hold investor with a portfolio getting close to 70 units. Is there a point that investors reach when buying for cash flow when they become too big to fail.  It seems that if you are buying cash flowing properties that at some point there is so much operating income coming in that you at some point are generating enough money that as long as you do not take from the business income from the business.  It seems at some point even when using high leverage that it becomes a game of staying power.  You can borrow from peter to pay paul etc?  What am I missing?