Mike Goldberg needs to be there. He's the man to hype all of the PPV's, tell the backstory and do the play-by-play. He's very good at what he does, although he's no good at explaining transitions without Rogan or Couture there to guide him along. He's good at feeding off of Joe and Randy, and I'm sure he'll approve. I don't see him going anywhere.
A Frank Mir, Joe Rogan, and Mike Goldberg team would be fine by me. Mir's not so bad, he gets a little confused from time to time, but he's quick with his corrections.