I Don't miss the Dudley's because I still see them every week as a team in TNA, so they haven't split up.
As for a tag team that shouldn't have split up I would have to say The Spirit Squad. Yeah I know a whole load of you won't agree with me because lets face it only a small minority like me actually liked them.
I found them so entertaining with what they did. They never gave less that 100% which is why their team worked. When they split however, we were left with Kenny who was so misused its unbelievable and then the rest were sent back to Development with Johnny, Mitch & Mikey being released.
More recently we've seen Nicky back as Dolph Ziggler who had a great first couple matches but he is now on the backfoot with him losing a lot of matches.....much like what happened to Kenny.
Johnny was a talented wrestler I thought and could have gone into a believable feud with Kenny perhaps for the true "leader" of The Spirit Squad.
Ok Mitch wasn't so good so wouldn't have got very far.
Mikey was like a little pitbull who could have been a vicious heel if given the right gimmick.
As a team I felt they worked well together and were put into some great storylines and because they consistently gave it their all every week it worked. I feel they could have done more with them in the long run than what they did so shouldnt have been split when they were.....but hey thats just my opinion.