In twenty years when everyone has 3D goggles at home will anyone think it is a gimmick? Widescreen now isn't. Colour now isn't. Sound now isn't. Am I going too extreme? Remember what Harry M. Warner said in 1927, the year before the first of the talkies; 'Who the hell wants to hear actors talk?!'.
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At the time, nobody. The actors weren't known for their mellifluous voices; they were known for their abilities to look pretty and emote with great elan. When talkies started, there was a transitional period ... it took time to find the right way to distribute soundtracks, and to create good soundtracks in the first place. Clara Bow, due to her voice, was no longer the It Girl. But Hollywood quickly learned to do it right, and sound is now considered something of a standard for most movies.
Three-D has been in an extended form of this transformational stage. With luck, we've finally ironed out the technical problems and we can get a standardized process set up. (And theaters be darned, I want to see this on 1080p discs.) I'm not sure if we'll still run into any "artistic" problems with the process, but anything is possible. This is the industry that managed to screw up two different Star Wars DVD releases, after all. (And I expect the mistimed film that ILM sent to Lowry will be used for the threedeification.)