I’m not sure what I think about the wedding.
I really want to see the development of the CS dating relationship not be rushed into season 3B while they are doing nothing but trying to figure out the whole WW/curse thing. But then again, we got all of Snowing in brief EF flashbacks during season 1 and they really had ZERO dating at ALL. So if they stay consistent with their Snowing/CS parallels, it actually makes sense for CS NOT to have any kind of true dating life and to just go from adventure straight to marriage.
One way I could see them going with this is to focus a bit more on Hook’s past leading up to the suddenness of a wedding. If one of them is cursed or near death (which I am guessing will happen so we get our TLK) it could make Hook think about how he loved Milah but never married her but was still destroyed when she died – yet he loves Emma ten thousand times more than Milah and realizes that he doesn’t want to ever regret making the same mistake with her now having confirmation that they are True Love. And I’m guessing that aside from Emma admitting that Hook is her True Love she is going to realize that he is also her HOME – which she has NEVER had before: not with her parents (even after she found them because she still felt like an orphan), not with any of her foster families, not with Neal who abandoned her and never came back, not with Walsh who she WAS going to marry but ended up being a flying monkey. The only home she ever had was a fake one for the year with Henry in which he even gave her the speech about needing to trust that not all guys are going to be like his dad and that they would still be okay as a family of three instead of just two. Once she realizes all of that I could see her deciding that marrying Hook would give her what she has been looking for.