If you are holding off buying a new TV in hopes to wait for a 3D supporting TV, I wouldn't bother.
I'm sure if the TV can do 3D then it'd be able to support regular TV. I also wouldn't hold my breath for the whole 3D tv to become a reality anytime soon.
I'm sure they are going to improve the technology but to make it affordable in the next 5-10 years seems to be a stretch for me. However we'll see .. in the future.