Join Date: Oct 2006
Location: Edmonton, Canada
This happened to Frank Mir after his accident. The interim title went up, I think it was Arlovski that took it. I believe it was a year afterwards that Frank was scheduled a fight to keep the undisputed title, but wasn't physically able at that time... so they stripped him of the title, and Arlovski then moved from Interim Heavyweight to Undisputed.
So Interim titles are infact necessary, because for all we know, Matt Serra might get a number of ops done on his back, or reinjure himself and whoever is holding the Interim title after that year would probably be promoted to Undisputed.