Definitely not. And by that, I mean I will definitely not stop playing these games. :)
4th gen had some of my favorite games, and I will probably play these games a lot, even with the release of new games. These games will always be remembered, for me. I still even return to some GBA games I don't like as much now, so I will probably play some of these 4th Gen games even more, usually when I finish the new generation. And unless they create like 10 new generations within the next few years, I'll still be playing these from time to time.
Another reason to keep on playing is that this generation was the one where I really start to got better, and not really as, well, random, as in earlier games. So basically, I have a lot of memories from this.