The type of crypto the world ends up with will absolutely not be BTC or ETH. It will be closer to Zcash with zero-knowledge proofs, and will like only be used for things like international exchanges, escrow, new types of trusts (contracts are quite brilliant), or transfers between banks. People will use it the same way the used to use Moneygram, or the way they pay a thousand dollars for an escrow agent. I also believe every bank and country and possibly corporations will have their own blockchains. I have a strong gut feeling I'll never be buying a sandwich with crypto in my lifetime.