The problem with a polarized setup is cost - you need two projectors and a special screen designed to maintain the polarization (regular projection screen won't do, apparantly). LCD shutters lets you get away with a regular screen and a single projector.

I agree that polarized is the more "desirable" setup, but the LCD shutters is likely going to be mainstream, and the ones I saw actually looked fine with no flickering. And I'm the kind of guy that can take one look at a CRT monitor and tell you whether it's running 60hz, 75hz or 100hz. :-)