I like this idea.
This proves who really deserves to be at the top. Sure it will set some people back, but this is the best way to make it interesting for the casual viewer.
On a business level, it makes sense too. You don't want to strip Franklin of the title yet as where he's one of the faces of the business right now. I say in order to build this up, have Franklin do commentary during these MW fights. Good way to keep building up the fight for when Franklin makes it back.
If you have Leben/Silva at UFN, then Swick/Marquart at UFC 62 or the next UFN. That sets up a #1 contenders match at UFC 63 as the top non-main event match (main event is rumored to be Babalu/Liddell 2). UFC 64 should mark the return of Franklin. This will give him plenty of time to rehab and be 100%. This would be a great gameplan for UFC on a business level.
"Hang The Dj"