I think the 3D will pick up a lot more when they make bigger 120 Hz monitors. Until then, most people won't buy it, especially if they have a 24" plus monitor. Makes to sense to downgrade to 22" just for 3D.
Ya I actually upgraded from a 20" to a 22" though & i'm now using a multi monitor
Also a thing to remember with these LCD TV's that are 120hz at the moment is they don't accept signals at 120hz so aren't fully compatible (taken from Nvidia them selves) they need to be "3D Ready"