I think to dictate what people should or shouldn't do with their machines is silly. Search the forums and the internet. The Air has proven to be plenty capable as a gaming machine for it's size and has many satisfied users talking about it.
A computer is certainly a tool, but it can also be a gaming machine, a home theater pc, an entertainment hub, etc.; whatever a user may find use for it for.
Obviously, certain machines are better and worse at certain functions than others, but don't forget that this generation of MBA, there are people that actually did go out and buy the Air because one of the reasons is that it did happen to be a decent performer in games, while remaining ultra portable. In this case, I think the Air strikes an excellent balance between function and form.
I use my Air for live music sets and this is exactly a scenario where such a BL KB would be grand. I read similar opinions from other musicians on this forum in another thread. Creative artists like live musicians can definitely find appropriate use for a backlit kb, but even average everyday users who don't share the same skill level as you would also benefit from it. If anything, adding convenience is always a welcome.
If you don't want or need the backlit kb, then you could always turn it off. It's there for people who might need it. Win-win situation.
You sir, just made my morning
And i Think this thread should be rename into:
Sandy Bridge and Thunderbolt + HD3000 vs 320M