I didn't mean that everyone should just buy more and more coins until they have no dollars.

I only mean that if someone is in a position where they find their marginal coin so precious that spending it on something that they want seems stupid to them they ought be buying more coins. Coins are clearly more precious to them than the market rate so they should buy some more until that is no longer the case.

To use myself, I think the expected value of coins is somewhere around $100000. Yet I use them all the time. That's because ~$300 now is worth as much to me as $100000 will be to me when coins are $100000. If I had almost no coins that wouldn't be the case and I wouldn't spend coins, in fact I'd buy a ton of them until that last coin I bought wasn't particularly precious.