I very much disagree with duck's assertion that while motion controls only impact a select number of games, increased potential for graphics impact all games.
Better graphics are not a design choice. Photorealism is, but that's not what "better graphics" means. Visual fidelity and verisimilitude are not the same thing, even though most people conflate them. The claim is not that highly-detailed realistic worlds will improve all games. The claim is that better fidelity to the original designs--created at a "resolution" far higher than any consoles allow--improves all games.