Are you asking if I think that's worthwhile enough to justify being in the same park as MIB? On paper, sure, I guess. There's a version of what you just described that I might enjoy quite a bit. It's all about the execution. If there's a lot of physical setpieces and elements interacting with projected stuff, that might be neat. If it's "walk to this screen and play an interactive mini video game, then walk to the next screen and play an interactive mini video game," that wouldn't be too neat to me. Given the timetable (it seems Universal wants this open by next summer-ish, and they haven't started yet), I'm expecting much more the latter than the former. I'm open to the possibility of being wrong.
Now, am I also miffed that Universal's apparently not putting a dark ride on this plot (for quite some time, at least), therefore making me somewhat disinclined to be favorable towards this whole concept? Yes. I have to be honest and put my cards on the table on that front.