If they use those polarising glasses like they do at the 3D Imax screens then I cant see the problem. They arent uncomfortable to wear and as it will be a long time before everything is in 3D, as it is for HD now and as it was for colour when that first came out, then a couple of hours an evening would be no problem at all for most people.
I cant see why they would need new TVs or extra equipment if current SD DVD players can do 3D using the red/blue or green glasses then why cant the polarised glasses do the same thing. Its only if they are going for the shutter type of glasses or the no glasses 3D TVs that you should need new equipment. Given the extra cost that would involve I would happily go wit the polarised glasses method