[beefield]

Each one of the cryptocurrencies I have encountered relies on the idea that the supply is somehow predefined.

Give me a cryptocurrency whose supply is adjusted based on the needs of their users and I am interested. Give me a cryptocurrency that allows heavily negative interest rates for savings to embrace current consumption in the economy over hoarding of "money" and I am interested. But these are complete anathema for the current cryptocurrency folks.

[omio]

It can be done easily. I would say it will be done in the future by governments and forced on us. The amount of control a government would have with a forced cryptocurrency is the only problem I see.

[beefield]

Yes, easily if it is made by government. But if you wanted to do that without government help enforcing things bit in a distributed manner, I find it a bit more difficult.

[cableshaft]

There are cryptocurrencies out there that are inflationary, although it's a set inflationary amount. Ethereum and Dogecoin are two of them.