Don't forget that not everyone has brand-new hardware. Make sure your games will work on the hardware that people have today.... or ever so slightly later!
Gotta be an amazing magician to predict these issues.

Try keeping pace with HW manufacturing/engineering corporations and i'll give you a number of warehouses full of junk which really isn't (or, wasn't for awhile).
Upgrading a PC is an issue, true. But when it comes to a gaming dedicated gear, i doubt many people would stack X (oh, say, just a relatively small 15% increase of annualized growth) amount of ca$h just to maintain a high-end machine which will, inevitably, become almost obsolete in less than a year or so.
Lesson being that today's standards can be extremely & rapidly changed.
As the Blue-Ray/HighDef DVDs market ongoing ferocious
competition should teach us all.
- Zyxpsilon.