If everyone in the world gets into crypto and cryptocurrency will become an official global currency, do you think bitcoin then will stop depending on fiat currency? Or will it just co-exist with fiat?
Yes it will. But that will happening if only cryptocurrency became a global currency used by everyone in the world.
Many peoples still afraid using crypto because many hacking occurred in crypto. Developers of the coins should make a way to prevent hacking in the future, although the mistake is on the users side, not on the system side.