Normally, I would agree with the 'larger is better crowd' but as you say 60% of the TVs use will be for gaming I want to ask one question: do you play shooters?
The reason I ask is games like Call of Duty, Halo and many popular first and third person shooters use a fairly narrow field of view (FOV). Now, if you're not familiar with the implications of FOV in the gaming space or how your brain interprets motion I'll try and sum it up this way:
The closer you sit to your monitor (or the less peripheral vision you have of the surrounding space) the wider your FOV will likely need to be for comfortable gaming.
The farther you sit from your monitor (or the more peripheral vision you have of the surrounding space) the narrower your FOV will likely need to be for comfortable gaming.
Sitting too far away from a wide FOV game will create a 'fish eye' perspective and sitting too close to a narrow FOV game could cause dizziness or other motion related maladies.
The bad news? The vast majority of console FPS and 3rdPS don't let you adjust your FOV-- instead, they err on the side of caution by setting the FOV narrow assuming you'll be sitting far from your set or you'll have the ability to just move back.
I find, for myself, that there is a fairly narrow range of distance between too close and too far for me to comfortably play an FPS especially in a competitive manner ( one of the reasons that most of my competitive play happens in the office from a chair with casters
FYI: 6 feet feels about right from my 46" (my 37" was way too small from that distance) and 7-8 feet feels about perfect from my 50" (these are head-distance, not chair distance). I should mention that for movie watching I could go MUCH bigger but find that the 50 is a nice size for a variety of content. For bluray in particular I could sit right in front of a 60" and be happy!