1 by 1 they will all go down till people open their eyes and start seeking for security. What do you think? And are DEXes going to be more usable exchanges instead of CEXes in the near future?
In future we will see decentralization exchanges more popular than centralized ones as with the increasing hacks, people will lose interest in centralized exchanges.
Regarding cryptopia , anyone knows if it will return back some day again and we can withdraw our funds ?

I don't agree with you. Centralized exchanges are still way more popular than DEXes and I am expecting it to stay away for a long period of time until the DEXes actually improve their horrible and laggy UI.
Even if Cryptopia returns, I don't expect them to give you back your funds.