SmackDown should definitely get the main event for once. This is definitely the case if Edge and Undertaker are competing for the title, which definitely should be the case. I think that a win by either man would please the fans, but I - being an Edge mark - would like to see the deadman lose his winning streak. In previous years, even though a SmackDown superstar has won the Royal Rumble, thus giving him the right to compete in the main event, it hasn't taken place.
As for the Raw "main event", my guess is that it will be along the lines of Orton vs. Kennedy. It was clear that Kennedy was planned to be in the WrestleMania main event anyway before his injury and I don't see Orton dropping the title before then, or even then for that matter. A great idea would be for the winner of Money in the Bank to defeat whoever the winner of one of the big title matches for the title. Now that would create big news.
Other than that, I couldn't really care less for the rest of the card, it just seems pointless and disinteresting to me.
I think I floated that Idea for WM23 for Edge to take down the Undertaker or Batista right after they win. Awesome heel heat. I can see it happening sooner or later too.
I honestly think Money in the Bank has run it's course this year. It jumped the shark with 8 guys in it. The card was horrible, and just a shit pay per view from top to bottom in my opinion. Now you break up MITB and have matches like Edge vs. Orton, Jeff Hardy vs. Kennedy, Matt Hardy vs. King Bookah, Finlay vs. CM Punk, or something along those lines, the undercard doesn't look so bad. I say quit sticking 6 of the guys that in the past would have made up the undercard, but instead load them all up in a match that has lost it's appeal.