I believe the sole time Nintendo could be hurt in the portables front is when the PSP launched. Sony was in an unstoppable spree, killing SEGA and dumping Nintendo to last. The momentum and hype was tremendous; even initial sales for both portables were comparable.
Now, Sony will follow on a very weak PSP, with Nintendo launching the successor to the best selling system EVER. Quite the opposite from some years ago, yet I have severe doubts if Sony can pull a Nintendo this time.
In my humble opinion, the PSP2 will collapse, and certainly won't reach the original in sales or momentum. As for Apple and the iPhone, the phone gaming industry is like the PC gaming industry to me; without someone to handle the wheel, you can't hope to beat the market leader, especially now that it's stronger than ever.
My themeforest portfolio:









