Same way with every other villain. Same way how Big Mom and Calamities will get rid of.
Highly doubt that.
Croc and doffy who tried to take countries were captured by marines and they were already present there.
Kaido is not only a yonkou but also hyped as someone who can't be defeated 1 vs 1.
It's clear kaido has to be thrown out of wano.
So point is who will throw kaido out? Defeating him doesn't mean you can throw him out.
Even if you throw kaido out then he is the strongest creature and threat of him occupying wano again or doing something crazy will always loom.
He already survived executions and escaped from marines multiple times.
He will be killed. That's how wano will end.