I think computers on average are getting slower. Laptops are now more popular than desktops, and I think netbooks will replace laptops. Therefore, the average computer's graphics hardware is steadily getting worse, even as the high-end hardware improves geometrically.
In three years, I think the average computer will be a netbook sold at Walmart for $100 with an Intel integrated chip, while the average Steam user's machine will have a GEForce 285 or better.
So I'd like to offer both the extreme high-end graphics we always have, as well as the really low-end simple stuff.