Nice idea, have a question though:

How do you plan to keep the price the same even when as you said "there could be millions of sellers and no buyers". Wouldn't people just exchange them for less outside of the in-wallet exchange?

I know if I had a coin that was worth x-amount but I couldn't sell it for x-amount I would happily take 80% of its value OTC, or less even.

I've always thought that the "Terra" idea (not to be confused with Terracoin) is one of the most innovative currency ideas, but it has it's own problems too.