Yeh Pany quotes 100,000 hours to half brightness. I wouldn't mind betting that in 5-10 years the technology from today will be old hat. Even a few years back all that was available for sensible money was a decent crt tv. I paid almost £1200 for my 32" Pany quintrix with pro logic 7 ish years ago. Back then it was top of the range. Mind you it was a huge improvement from my exrental 20" wood panel tv with teletext. I did get £150 knocked off the price by trading in the barely working 20".
Today I have a 42" PZ85 Pany plasma with 1080P resolution, digital tuner and sound, hdmi connections etc etc. For similar money as my crt.
So I wouldn't worry about screen life, in most case's todays sets have a longer life span than yesteryears crt's. And you will no doubt be replacing it well before then with somthing "decent".