People said the same thing about color - it was really crap for many years. And I still like black and white movies. I think 3d is doing just fine.
It's going to take something really significant to convince a whole block of TV watchers to upgrade their sets. In the US, it's only happened with the advent of color broadcasting (1960s) and HD/digital broadcasting (2000s).
Color really doesn't add too much to the experience of the movie. You can take color out of a lot of movies and still gain the same experience. By this analogy, 99% of the 3D in movies will always be gimmicky, even once adoption rates in theaters and at home are high.
Let's not forget the amount of money the film industry relied on from home audiences at the time of the B&W->Color transition... and the cost of owning a television at that time... and the penetration rate of televisions (b&w or color) people's living rooms (not even like it is today with multiple TVs per household in a lot of cases).
Well..the cinemas are making some money out of 3d for a while - even with a tv, it's a lot different when it's 30 feet tall. People say they don't see the point in the theater any more and I think thy're insane for not wanting to see a film the way it was meant to be seen.
Some films are meant to be seen on a huge screen, but some films aren't. Off the top of my head, '7 Pounds' doesn't need to be seen on a 30' screen to be appreciated. Films that are especially character-driven with little 'action' don't need to be seen on a huge screen (barring other things like shots of vast landscapes that set the tone for parts of the movie,etc).
I've seen Hero. There are films that make great use of color. Even looking at blockbusters like The Matrix, the mood of the film is set by the tone of the colors used and the lack of saturation throughout (and the 'lady in the red dress' scene wouldn't have made as much sense in b&w). Films like Amelie and (arguably it's spiritual successor.. though a tv series) Pushing Daisies also make great use of color (though it's much more in-your-face in Hero).
But some of the best films: Schindler's list, The Matrix, V for Vendetta, etc would lose a lot if the had to be entirely black and white. I would say that most films would lose quite a lot of humanness if they where to be presented in anything but colour.