That's basically how I feel too. The 3D is just an excuse to get them back in the theaters and I love that kids would be able to see them on the big screen.
It's hard to say how long the 3D gimmick will last. The future is really with the Internet more than anything else.
The 3-D gimmick came from people not wanting to pay to see movies and waiting for them to hit DVD and online streaming.
Now, while that's all well and good, and some people HAVE to wait for cheaper forms of the movies, there ARE a lot of us who love seeing a movie on the big screen. Plus, that also gives the negative effect of making sure movies are made specifically to make their money via streams, rentals, and DVD's. And that means, less budget. And while a lot of crappy action films should have smaller budgets since they're a waste anyway (Transformers any movie that wasn't animated by Toei), it tends to pick on smaller, independent films or well minded films that need as much money as possible.
So basically, DVD rentals and everything lead to crummier movies. Movies that are only made because similar films make money, at least when they come to video.
The 3-D thing was added not too long before Avatar, but definitely before any of us really noticed it. It was for gimmicky stuff like the horrible re-envisioning of Journey to the Center of the Earth. No one saw that. In fact, before Avatar, they might just have dumped the whole system. It wasn't widely available, there were only a couple gimmicky movies that did that sort of thing. I can safely say, the first 3-D movie I bothered seeing was the re-release of Nightmare Before Christmas... and that was hoops to jump through. 12 bucks at least and I had to go to the big expensive shiny theaters for that.
Now, even some smaller, independent theaters have it. And only a few bucks more on their already low prices. They're more accessible, and for a while they were doing strongly. Now everyone's kinda sick of 3-D... just when EVERYONE is making EVERYTHING 3-D.
But my point still stands... if it takes a dumb gimmick to see some Disney films again period, so be it. Some of us don't want the huge DVD movie collection, and those that do don't have the window of less than a year to grab them before that vault garbage, only to have to wait 10 years for a rerelease with 2 more special features (one being the obligatory Dizzy pop star doing a cover of a song from the movie).