You guys are only looking at it from one angle... Again, there's contract, reliability, relevancy, RoI, etc...
I love MiB, but it needs a major refurb. When the time comes, Universal will look at the numbers and determine if the IP needs replacing. They could very well keep it as MiB and refurb it, giving it the Spider-Man treatment. They also can do an IP overlay and keep the core of the ride together a la Disaster.
Of course, they can just nuke the whole area, too.