Centralized exchanges aren't going anywhere, they will become more regulated though. Going along with your thought exercise though, a smart contract would emerge that integrates non-smart contract blockchains and allows trading, like the internet computer or Flare/Songbird.
Probably so. Considering that centralized exchanges provide big taxation benefits to mainstream governments, it's unlikely they'll disappear from the face of the Earth. As long as "money talks", nothing else matters. Unfortunately, centralized exchanges will become more regulated (or strict) due to government pressure. This will bring some hurdles/obstacles crypto/Blockchain tech was meant to avoid in the first place. The more regulations imposed within centralized exchanges, the more the crypto industry will resemble traditional banking.
At least, there are decentralized solutions available. Things would've been worse if crypto was closed source and completely centralized. With an ever-growing number of decentralized exchanges and P2P trading platforms, getting access to crypto without going through KYC is a no-brainer. I'm pretty sure crypto will survive for a long time because of its resiliency. Just my thoughts
