r0bc, I'm wondering, why do you assume that 120hz is so great? I don't get it - especially when talking about 3d and flat screens. Technologically that's not making sense.
You need 120mhz for shutter based 3d only and that is because it will degrade any 120hz display to a 60hz one due to swapping the images per frame. You gain nothing by using a 120hz display as it's a regular 60hz display - the opposite really: because the image doesn't just "progess" (in motion) but needs to be swapped out and replaced the effects of low response time panels is much more pronounced.
If you don't use 3d then it still mostly depends on your actual FPS and the panels response time.
Seeing how consoles are framelocked and most computers don't exceed 60fps anyways it's basically pointless to have a theoretical 120fps available because the source of the image can't deliver 120 frames, only 60 or less.
All "regular" image formats (tv, dvd, blueray etc.) and as mentioned games (console, pc varies but usually also around or lower than 60fps) are FPS based and in gaming the response time of the display is way more of a limiting factor.
The refresh rate has nothing to do with image quality and it doesn't matter if it's fast paced sport or whatever.
This said I will agree that 120hz is a trend, because it sells, and thus newer displays will most likely be developed with this in mind. In other words many good screens coming out do have 120hz because many customers expect it. But them being so good is not because they are 120hz models - it's just because they are "new types".
I don't want to make 120hz look silly - it's just odd that so many people confuse the theoretical number with what can actually be provided by the sources. Traditionally the frequency is also a bandwidth variable - and I don't see the bandwidth of non-3d media rising - only for 3d media and that will halve it again back to 60. Even worse: while traditional 60hz flat screens are without flicker that's not the case anymore for 3d as the continuous swapping often results in ghosting and blurring which then often leads to feeling dizzy or getting a headache.
