I just don't understand an industry that is remarkably similar to requiring people to upgrade their cars just to be able to play a new music CD in their car CD player.
Oh, I very much agree that PC gaming is in a serious decline. The battlefield 2 syndrome (you could probably attribute that to a more popular game, if I could figure out which one) is very detrimental sales. So much so that when Microsoft presented the X-Box as a PC developer friendly platform, many left and never looked back, and others just decided to half-ass the PC platform for a fistful of dollars more. Thief 3 would be an excellent example of such shennanigans.
But I've not seen many open source games that are of high quality, that even comes close to five years ago. Most of the ones that are, come from the results of a single guy working hard to clone a game he liked before (crack-attack, wesnoth, armegettron). Partly, game authors on the PC need to start looking towards smaller, simpler games than the massive 'partake in a joint operations military strike, fighting from base to base in a set of vehicles in the dusty dunes of Iraq, working your way up from soldier grunt to squad leader to divisional commander.' They're massive undertakings that rarely win back their investment, and they begin to all sound alike.