For me I've accepted that MIB's days are numbered, as much as I love the ride, it's hard to ignore the key things...
- The ride manufacture no longer exists, so the ride system (same with Cat in the Hat's) is gonna' get more and more expensive to maintain/replace parts etc.
- MIB is a sizable plot of land (which can also be made even bigger if FFL goes with it.) Which makes it quite a candidate for the location of a new attraction, especially when you add in the above point...
- Let's face it, everyone and Universal themselves know F&F: Supercharged is a DUD. An it's pretty much agreed that they should have a better attraction for what is one of their biggest franchises. The only catch is there's two attractions which a lot of people feel would be fitting, a slot car attraction, or a launch coaster. Either choice is going to require a good amount of space, and when you look at the above two points...it makes perfect sense why there's a rumor of this happening.