It seems that at any given time about 1/3 of my local theater's screens are 3D. Also non-3D movies have broken the $10 mark, which I think is a fairly important psychological barrier.
Hey I'm not complaining at all. I'm perfectly happy watching at home on disks I borrowed for free from the library, or traded with my neighbors with large collections.
They can raise the price all they want for their empty theatres, I'll never complain.