The way they "Deep Fry" the show with flashbacks and flashforwards, I could see them still making it interesting.
Yeah, I expect minimal time to actually be spent at the wedding-proper. I expect flashbacks and flashforwards. And flash-sideways. And I expect them to learn the lesson from LOST's failure to utilize the same techniques.
We know that they screentested the mother with Ted, so they will share scenes next season, otherwise it's useless.