I'm inclined to agree that passive will win. No flickers from windows and electric lights, and it is emerging that a very important consideration to buyers is light, cheap glasses.
I have an active which I will hang on to until the technology has progressed to a satisfactory state. It isn't there yet in passive or active. My current set is a Sony, so as long as I turn off lights, draw the curtains and take regular 'glasses breaks' to allow the bridge of my nose to recover, then the experience is tolerable. Sony is the new name for Shoddy in my opinion. Passive sets just make the image look 'hollow' compared to active with its fuller HD picture.
So I'll sit tight and wait. Maybe the tech will not get there for another few years.