It's because WDW and TDO know they can phone it in and it will be seen as "good enough". And people will still pay, and will still visit. That's why the magic is being lost, that's why attractions are value-engineered. Just look at Under The Sea. DCA is fixing it. TDO likely sees no need to because it's "good enough" and people will still ride it (FYI, I'm seeing more and more simple 20 minute lines than the insane 50-60 minute lines of the past). That is where the problem lies and that ride is the perfect example.
And then you will have the guests who insist everything is wonderful and amazing and we should shut up and be grateful. Don't get me wrong, I do still go to the parks, but it has been a very long hiatus for me in going to them, for the simple fact that nothing new was developed there. Period. And not that what was done now was some big huge draw but I still care about the parks and want them to be the best that they can be.
They continue to rip away the little things (and those little things add up to someone wanting to repeat visit, so while you may say it's "not a big deal" in the long run, it is). People went out of their way to look for Push, to look for certain entertainment offerings, to look for those little things that people rave about. What happens when all of that's gone? That's what made Disney stand out. That's what put them above the rest, the clear care that went into things.
Now they slap up some ridiculous paint scheme in EPCOT and I have to be lectured on "oh well, at least they're painting". Um, no. It should never be "oh well ... good enough".
Would you say that with your car? Oh well, they fixed it up good enough. No, you want your car to be in perfect condition and enjoyable to drive. You can only paint lipstick on a pig for so long.
And I personally don't think parents give their kids enough credit where the theme parks are concerned. Kids to me seem very interested in the culture and the experience and the rides their parents went on, not because it's overlayed with characters. That's the parents believing it will make it more appealing. Why were so many rides and experiences just fine for practically 20 some odd years (and still are around the world and at Disneyland?).
Sorry for the rant but I felt it needed to be said.