I would never pay more to get a basic feature like a good quality screen. It's not as though the 15" is cheap! Also, the 17" is a beast, albeit compares favorably to other 17" PC laptops in terms of size and weight. The 15" is the perfect compromise between power, portability and comfort.
I'm miffed that I still can't get a MBP that is the equal to what my old powerbook G4 15" 1.67. The more I think about it, the more happy I am that I returned the MBP since I know I would have always been annoyed with the display.
Maybe Apple will address this in the near future. remember that it's hard to just discontinue a LCD since there are contracts with suppliers and it isn't easy to find a new supplier over night that can fill huge orders. This will only happen over time.