XD Having a job and going to college doesn't mean you can't play video games anymore, you know. It won't be something you do as often, no doubt, since school work is rather important in comparison to games. Most people who play video games have a social life, as well, but you might simply lose interest in playing Pokemon as some of you mentioned. The deadline being within the next three years doesn't make much sense as far as the possible loss of fans goes, because they gain new fans and lose old ones all the time as people get older.
Myself, I come back to Pokemon every once in a while since it's a nice light-hearted break from the other games I play when I manage to find some free time, and I would love to see a remake of G/S - even if it ended up taking that three years. It could serve as the bridge game to give fans something to do while waiting for the 5th generation games, or it could be a part of that generation itself. If I remember right, G/S came out roughly 4 years after Red/Green in Japan, and after that each generation has been out roughly 3 years after that. If they keep up with that pattern, 2009 should be the 5th gen release year. Would they release the G/S remakes a year after the 5th gen, like they did with FR/LG for Ruby and Sapphire? Or wait a while?