For BTC to hit $1,000,000 *and remain there sustainably*, every American needs to buy an average of $2.72 of BTC per day. This would cover all the newly mined coins.
After the next halving, the amount required becomes $1.36 per day.
Discussion
(Obviously there are other sources of buying and selling, but this gives you some context)
Oooooops might have done a bit more than that the last few days…
https://giphy.com/gifs/latenightseth-seth-meyers-lnsm-late-night-with-fzKJBH8EVOu8GFD9yf