Originally, they said that when 4K is implemented, we would have glassless 3D. Obviously, that hasn't yet happened.
That's because resolution has absolutely nothing to do with us having two eyeballs.
The technical requirement for glassless 3D is that each eye needs a completely separate view. This can only be achieved by using lenticular screens. Which doesn't work with front projection at all, and is nearly impossible, to downright lousy, with direct view displays.
I've seen some, the effect of glassless 3D is pretty fun. Fun, not good.
The reality is that we will need something closer to holographic screens which are capable of incredibly tiny differentials in viewing based upon angle. These screens would cost tens of thousands of dollars at this point, and still likely would need two projectors to deliver a proper stereoscopic image to them.
But, I can say, that I'm a huge fan of watching 3D movies on my home projector. It is better than theaters, and my family does not suffer from headaches with 3D. So, at 161" (our screen size) the immersion is spectacular, and the 3D makes it even better.
I never watch 3D on my 65" plasma.