1) why do you feel that slinky dog ride will leave adults "unsatisfied"? because it's not a thrill ride. I have four adults in my family, no one likes thrill rides. one of hte main reasons we don't do Universal. so I disagree with the premise that the rollercoaster will leave folks unsatisfied.
2) now as for "technology" in rides, I have to admit I cannot comment on this. I have no idea how much "thought" goes into any ride and the simple truth is I don't give a furries rats behind. lol, sorry no I do not go to theme parks nor vacation destinations requiring a behind the scene knowledge of how the rides were developed. I don't know anyone who does (except it seems here) pretty much our criteria is simple. Was the ride fun? We like the Mine train ride, we hate that its very short but we love to go on it. Do we really care that the design was changed and shortened? humm no.
3) Opening days as far as capacity are always a mob scene. I avoid them like the plague. Do you not remember Pandora, and yet folks loved that one. Do you have some inside track into guest satisfaction.
4) lol I find it interesting that you say guest will not be satisfied with a ride that's been open for 10 years on this website. People here had a freaky deaky melt down when a scene was changed in POTC and that ride is over 30 years old. so obviously age and satisfaction are not totally related. TSM is a popular attraction and will remain so, the extra ride track will hopefully address the wait time issue.
So what I find totally interesting is the "predictions" you seem to have on guest "satisfaction". Basically how do you know? You say there will be no "payoff" by going to Toy story land?? I find that a preposterous prediction based on the simple fact you cannot possible know what guest will like or dislike. How many of the visitors will be first timers? how many will be return guest? how many will have small children or not?
So will it be a "Disaster"? hardly. Will it be crowded? absolutely, doesn't take a rocket scientist to figure that one out. Middle of the summer, brand new attractions, do the math.