I'll just say I've had my TNG and DS9 season dvds for years, and the video quality has never bothered me. But I have had my tv for years and it didn't cost thousands of dollars to buy.
My 1080p 40" LCD, bought back in 2009, cost me $569 before tax. My 1080p 3D 32" LCD, bought earlier this year, cost $369. I'm not sure where you're getting that people are paying thousands of dollars for HDTV's.