I believe that in order for homebrew to become mainstream it has to be really good. The best way to do this is for a bunch of talented people to work hard on a single thing. All these small games are great, games like squarez, and others that are simple but fun as well. However the only way to get a lot of people interested are to make 3D big professional looking games. Games such as iris are borderlining this. I think that if all of the great homebrew game makers got together to make a large fun proffesional looking game (maybe some sort of multiplayer GTA like game) that was playable on all the firmwares (you need gta to run homebrews on 2.6 so even more insentive to make it GTAesque), that would involve the masses in the joys of homebrew.