Maybe there should be a centrally agreed upon authority that can change the size of the money supply by fiat. That seems like that would fix most of the problems with Bitcoin.
But a cryptocurrency doesn't have to be designed with a deflationary monetary policy hardcoded. Monero, for example has a steadily decreasing block reward that will bottom out at 0.6 instead of Bitcoin's 0. Ethereum is also designed for a steady increase in supply if I understand correctly.
As others have mentioned, these institutions is exactly what Satoshi wanted to supplant.