I didn't purchase my Palm Pre to play games on it, but I'm not closed to the idea that, should the right game come along, I might play games on my Pre / phone. It all depends on the gameplay. For all we know, a new type of gameplay might still be created, one that would fit phones perfectly (has some elements of RPGs or tamagotchi coupled with GPS?)
FPS games might prove challenging, but vehicle simulators might not be too bad. There've been videos of Need for Speed Undercover allegedly being ported to the webOS / Palm Pre platform.