But the incentives are in place to keep the search going for quite a long time, even if it’s mostly aimed at unlocking supplies of greater fools.
One case that's happening now, which is very useful, is the burning of stray methane to create bitcoins. Companies are creating bitcoin rigs that can be placed near wellheads that are spewing methane into the environment since there is no profitable way to stop it or use the fuel. Bitcoin is the way to use the fuel that's being released into the atmosphere.
Many inventions "were meant to" to do one thing, but wound up doing something else far more valuable.
The value of a tool has little to do with the original intent of its inventor.
Most regulations apply to financial institutions, if your blockchain is provably decentralized (as in, nobody can rug/fraud you from your money), then a lot of regulations do not apply.
Why would anyone accept payments in this if it's volatile?
So why would you want to have a volatile currency to make small payments to people who don't accept it?