Universal glasses are now being made. They work quite well on different systems.
The price premium is not that much these days, and you don't HAVE to buy a new Blu-Ray player. If you have a PS3, it now has a firmware update to let you view 3D content. If you use a computer with ArcSoft Total Media Theater, they have a new version which supports it as well as a plug in for the older version to support it. But a new Blu-Ray player isn't that expensive either.
If you want to watch the occasional 3D movie, unless you are one of the few unfortunate people who have a legitimate medical problem, the glasses are comfortable enough and the viewing angle is wide enough that 4 people can easily watch a movie together in our living room. Those of you who crab about the shortcomings are just not interested enough to look past your own nose or else the new technology scares you and you want to make sure no one knows you're scared of it.
It's cheap. It works. It's bitchin when you want to watch 3D and it's awesome 2D when you don't. No brainer. 
