Speaking as an industry expert here, I have to agree with the Frogboy on this. 8D
Passive 3d is definitely the way to go when watching movies, until (many years into the future) we don't need them. There're are very solid technical reasons why it is the technology used in movie theaters. Also, the glasses are the same as used in RealD theaters so it's very cheap to have a lot of friends/family over to watch at home whereas that is just not affordable/practical with expensive active glasses.
I am less sure on playing games, since active glasses will be going to 120hz per eye (240hz for the tv) and higher, and that will induce even less eyestrain than the RealD solution (which is 24 frames per second per eye, showing each frame 3 times to reduce LCD fading/lag). Theoretically that should give better one-to-one eye-hand coordination and therefore reduce brain fatigue and eyestrain.
But that's only a consideration for games, as currently all movies (except Imax) are being shot at 24 fps per eye. So, Passive FTW.
3D isn't going anywhere. All CGI animated movies (Pixar, etc.) are natively 3d by design. We've just been unable to view their third dimension until now. Expect all CGI anmated movies to be 3d from now on, period.
Similarly, now that the technology's difficulties are getting ironed out (i.e. brightness, sharpness, crappy conversions) more and more top drawer directors are turning to 3d from here on out. Namely, James Cameron and now Ridley Scott will not be making any movies not in 3d anymore.
Hell, we can thank 3d for finally forcing Michael Bay to shoot action like it's a film not a commercial. While it doesn't help his narrative weaknesses any, it sure does make his action sequences a helluva lot easier to follow. And for that, we can be grateful. 8P
It's up to the buyer to beware, however, as there is a LOT of crap 3d out there...just as there are a lot of crap movies.