Right now a lot of people are using Ubuntu, and even some of the new netbooks are coming stock with Ubuntu. Is it possible that games might be developed for this in the coming years?
Not really. Two years ago, everyone was using Fedora. Before that, Red Hat. Linux users simply jump on the next bandwagon when the next big thing comes out, which is a major deterrent for devs (not all linux distro's are binary compatable, so you can't guarentee "linux" compatability.
Its such a small market, it gets ignored as the cost of making a linux game is far more then any potential profit.