The problem here comes in from the fact that we have known the stock market all our lives.

We have never experienced a real stock market crash.
Or, the very real catastrophe of the stock market ceasing to exist.

It has always been there.

McAfee has STATED (quite loudly) that bitcoin is going to $1,000,000 each.

And there is almost no doubt in my mind that it will reach those highs.
However, i doubt that bitcoin will reach $10,000,000.

Why can it reach one number and not the other?
Because, at a certain point in time, things will go no bid.
The dollar will be worth so little, that no amount of them will buy a bitcoin. Not even a satoshi.

The entire idea of trading fiat for cryptos will just disappear, seemingly overnight. Further, all these exchanges are going to fail, and fail badly. Most, it does not appear, have all the bitcoin they say they do.

So, along with the buying low and selling high
you have to factor in
will you be able to buy at all?