Here's what I think would help rejuvinate the tag scene...
1) Move the teams to one show. SD needs as much help as it can get, throw them on there.
2) Remove the "Tag" from tag team. Have all matches Tornado Tag rules. Personally, I think WWE should partially adopt the ECW style. Screw DQ's and count outs. Start the match as a normal tag match, if it degenerates into a tornado tag, so be it. If someone grabs a ladder, let it go. Table? Go for it. Not only does this mean more action, but it could help some teams, specifically the Dudley's, to gain some of the recognition they used to have.
3) Put the belts on a good heel tag team, have them dominate the scene for a while. Have them do promos saying they have beaten every team the WWE has and no one can beat them. Don't book them on the next PPV, but during the night have them come out and talk about how they're the best and that WWE doesn't even have a match for them tonight because they are so good. During the speech have something big happen, like two of the top people on the show form a team on the "spur of the moment" to take down the heels. Like, put RVD and Booker T back together..... and have them LOSE!! Yes, lose!!
Do near the same thing for the next couple of PPV's, have them come out and saying they don't have a match because WWE has no competition for them. They lay out an open challenege and successfully defend the belts again. Then on the next PPV after that, have a total underdog tag team come out. Some people who may need the help in getting over, Like Super Crazy and Tajiri

and have them win.
Anyway, I think it would all work. They just need to make the belts mean something again. And make tag matches not so predictable and boring. No one wants to see a double clothesline that ends with the face tag member finally making a tag to his partner, after 10 minutes. Nobody wants to see the good guy trying to get into the ring to help his partner, but in effect is only allowing the heel team to double team his partner. That stuff might of worked 15 years ago, we need something new.