Easiest road to universal 3D add-on? (shutter vs polar vs anaglyph vs 0 eyewear)

[8traxrule]

Anaglyph 3D just looks awful. There's just no way to keep the color accurate on it. I keep hoping someone will come out with a way to add active shutter 3D to any 2D display; the system for standard-def TVs used with Sega video games and VHD videodiscs (and a few bootleg VHS tapes, and later some DVDs of IMAX films) worked decently enough.