I'm one of those people willing to wait for better games too.
What baffles me though, is why it takes them so long to do virtually nothing besides add content.
It's not like the restructured the game for any of the past delays, game modes and features remain nearly the same. GT6 was basically the same as GT5 after updates, minus some updates.
They added cars, tracks, and a few scarce modifications, a moon mission, annnnd slightly updated online play.
What takes 3 years about that? Point is, it's a repeated history now of these delays and there doesn't seem to be a reason at all.
The games aren't "better" after they take a long time, they're effectively the same, with the primary difference between any single iteration of GT is the cars and tracks.