Strangely enough (or demonstratively perhaps?) we're now seeing people do just that because they're forced to, in economies that are increasingly pressuring people to seek alternatives for currency.
That's how we progress due to the overall lazy and ignorant nature of people. If you don't terrorize people as centralized exchange, people won't have any incentive to look for an alternative.
It's because of AML/KYC that people see no other option than to use decentralized exchanges. It's because all the thefts we read about that force people to use decentralized exchanges.
It's basically the same with fiat as well. If fiat was working perfectly and didn't lose value, and banks weren't greedy jerks, people wouldn't even use Bitcoin. By force they learn that they should look into non central alternatives.