This would all be amazing. I feel like if you asked a guest about the tower of terror, they would tell you some detailed cliffsnotes of the experience, where you go into an abandoned hotel and that the ride goes through the hotel before the elevator gets struck by lightning etc... people fill in the gaps and always talked about it like they really believed the ride. They bought into the tour of the hotel. You ask somebody about mission breakout, and they just say its really fun or its awesome. Nobody actually feels that engaged by the ride/story or buys their involvement with it.
What you are eluding to reminds me a bit of alien encounter. How wicked would Mission Breakout be if there were scarier gags incorporated and practical sets, and strategically placed moments of complete darkness along with audio effects to really make poeple feel threatened by whats going on and immersed in the chaos. It seems like disney goes back and updates the classics that don't need updating a lot, but we never see them fixing attractions that opened less than perfect. Can you imagine new sets in RSR, Pooh, or M:BO, now that its already undergone such a dramatic transformation? Would be cool though to see some changes in a few years to "keep it fresh" but really just to execute better on what they were going for.