THe vast majority of people don't game in 3d, many people with 120hz and/or 3d capable screens don't play most of their games in 3d, most people don't have 3d capable machines. It's not, has never and won't for the near future be a standard thing for everyone. For all the above reasons it will never be standard.
On the other side, I don't know ANYONE who dislikes higher res screens, everyone always wants more res and more power to drive higher res. I don't know anyone (personally) and only a very minor percentage of people on here, an enthusiasts forum, who want to upgrade for 3d gaming. After years and years it's barely mentioned. Eyefinity, 4k, or simply higher res screens get mentioned all day long every day, 3d... barely ever.
The AMD threads of late, the tech event, the conference, no one even mentioned missing 3d talk, no one said once "I hope they talk about 3d", lots of people have been talking about 4k, I think that says it all.
AMD would care about it if everyone on here was asking for it, no one is. Same for 3d tv's, the industry are saying no one wants 3d. The vast majority of tv discussions on this forum have 9 out of 10 people saying "tried 3d on my screen, didn't like it/don't care about it/seemed a waste" while 1 out of 10 say they love it and use it all the time, infact I'd say those who use it all the time probably number in the 1 out of 100.