Maybe you know me and the apps I've purchased better than I do, or maybe you can go fuck yourself.
You maybe, but the meatiest share of the market? No.
I'm far from an expert here, but I'd say one of the biggest things standing in the way of the iPhone having good games is that nobody is willing to pay for them. If Nintendo suddenly jumped ship and started making cell phone games, you wouldn't get Metroids and Zeldas, you would get
one stage of WarioWare.
And in an absolute best-case scenario where you
did miraculously get Zelda on iOS...
A game that is actually DESIGNED to be played on a touchscreen could easily be a masterpiece.
...you would get Phantom Hourglass.
The various smartphone platforms have some occasionally interesting titles (I have Superbrothers on my iPod and occasionally sink some time into it, myself), but the idea going around the internet that Nintendo is dying wouldn't mean that the iOS would become suddenly saturated with traditional games, it would mean that traditional games would be altogether replaced by Angry Birds and Farmville.