If Carol and Daryl hooked up, it would be gratuitous. I'd hate it. Those two are finely tuned friends. They don't even need to speak to know what's going on. Romance would complicate that, and I don't see it happening as it's been written so far. There would have to be changes in the future for that to change.
I like the idea of Noah and Beth, if we MUST continue to tolerate her.
People are wanting Rick and Michonne to hook up, but I'm not sure about that one either. Right now, their world is about survival. When (if) things settle down and get safer, then they can worry about such affairs. Personally, though, if TWD turns into the match game, I'll watch something else on Sunday nights.
There's a whole bunch of speculation going around that Daryl's gay. If that's the case, who would he hook up with?