Laptop/iPad portability are not the same as iPhone/psp/ds portability. I take one of my laptops with me places regularly, but if I want a quick gaming session on the go (waiting in line, at the store, waiting to pick someone up etc..) the iPhone is the way to go. The fact that it fits in your pocket is important and makes taking with you everywhere seemless. The same is not true for a ipad. As I've said multiple times to you now, the ipad does tons of cool stuff, but it loses in portability compared to the 3GS.
It will all come down to sales. The iPhone/iPod market is just so much bigger, besides, those games will also be playable on the iPad, not the other way around.
