The truth is that Sony perfectly knows glasses-free 3D will bury glasses-based one once it becomes viable for home TV, but also knowing that glasses -free isn't ready yet, wants to be amongst the first to bring 3D to the living room anyway and sell expensive 3D TV sets also during the years bbefore new techs become available. 3DS will make people more aware of glasses-free tech, so more people will wait and won't buy TVs with glasses, but people wanting 3D now for their home TV will have to accept glasses as a temporary solution.
It's just a matter of tastes and also attitude towards novelties, I know I won't buy TVs with glasses, I also still hate plasma screens even now that their worst flaws are overcome, and I hated RPTVs too, for example, but I know people that loved plasma screens even when they still were undeniably horrible and unreliable. Heck, people buy iPads even before knowing what they can use them for...
...People even bought first series Mercedes A-Class despite it being inherently unstable and needing to be stabilized electronically, my trust in people's intelligence fell more for this than for them buying 3D with glasses or early plasma screens, at least the latter two don't make you risk your life... 
Stwike him, Centuwion. Stwike him vewy wuffly! (Pontius Pilate, "Life of Brian")
A fart without stink is like a sky without stars.
TGS, Third Grade Shooter: brand new genre invented by Kevin Butler exclusively for Natal WiiToo Kinect. PEW! PEW-PEW-PEW!

