I don't think we'll see any changes. I rode M:S at least 4-5 times when it first opened in '03. Then, rode it again several months later. I think they toned it down in between my two visits. It just didn't seem as intense in Dec as compared to August.
There is a ton of signage before you are allowed to enter. I have been on a teacup ride, with my younger brother, and I have to say..he had that puppy spinning so fast I couldn't move my arms or hands. I thought I was going to be sick when we got off. M:S really isn't all that different. The vast majority of people can safely ride it. Are you going to shut down airlines because someone throws a blood clot? Or if someone actually uses the 'bag' that the plane provides? I'm really sorry these people have died. It is heartbreaking to think that even in 'the happiest place in the world' these things can still happen. But, they do.
I have found that almost every time we have ridden M:S, there has been a 20 minute wait, at least. Now, my dd and I don't ride it nearly as much as we did when it first opened. It's kind of a 'been there, done that' kind of thing. My dh can't ride it since he gets a terrible headache. Dd and I have no problems with it physically....well, unless you count the time I ate at the Electric Umbrella, and then rode it...that was a huge mistake!!!