Not a doomsday scenario. That's what all "pixie dusters" want to paint any negative statements as. However, doomsday would be the park closes due to mismanagement, the company goes bankrupt, etc. We are not talking about that. Also, no one said they are incapable of building great rides. That's what's so maddening about this. They have the ability to maintain high-quality, but the lowering of quality has not met with lower satisfaction (at least in revenue, which is the only language Disney reads).
In this case the scenario isn't doomsday. It's accepting a carousel as satisfactory instead of a more interesting ride. The reasons Disney will likely do it anyway are because there are enough people like you that say, "You know what, there are other things that are great so I'm ok with lower standards as long as I get some good things with it."
To modify the earlier analogy, "OK I will eat the spinach. Just put it on my cake and I'll eat it together." Because we all know that will taste great.