most people have crappy computers
"Most" people don't play games. The ones that do understand the importance of having at least a decent computer. I ran 1.2 successfully (and at a good framerate) on a laptop that was entry-level 4 years ago. By the time 1.2 comes out (face it, that gives them a lot
of time), most of the people with that kind of hardware will have upgraded, especially if they play games. And the few who don't upgrade can just turn down the settings.
The engine is not
that big of an issue.
Models, on the other hand, are where the biggest drops in frame rate occur. Better assets = more polygons and bigger textures = slower framerates. My PC can probably handle anything thrown at it, and so I want better assets too, but seriously, think about what you're saying before you post it. The engine itself has much less of an effect on framerate than asset quality.