I admit that 49 is way too many Skylines, but six would be under-representation. PD is a Japanese-based company; the Skyline is the domestic hero for them, and the history of it is long and varied. Since GT4 is apparently about the history of the automobile, having the history of the Skyline seems appropriate. There's way too many from the past 15 years, yes, but six? That would give us what, the first GT-R, an R32, R33, R34, V35, and one JGTC? The people who generally are complaining about the huge amount of Skylines are usually the ones suggesting American cars be represented better. They want every tiny little change for the Camaro or Corvette available. Isn't that just as bad?
Yes, the game's saturated with Skylines. But you have to expect it. Don't like it? Don't buy them. Don't get me wrong; I'd like to see American cars more too. But until PD can make KY's dream of a car encyclopedia real, the fact is the Japanese market will always be the driving force behind the game's lineup. Constantly whining about it won't solve anything.