From what I can tell, the iOS crowd is (largely) a bunch of people who wouldn't/didn't play games until iOS and the sexiness of the iPhone made it socially acceptable (in their own mind). Or, they're adult geeks who did play games, but have that "Imma grownup now" syndrome and feel using a device beneath their tier of sophistication is unseemly.
Based on some folks I've actually talked to, and challenged about the attitude, I get a sneaking suspicion that in the case of the latter - people who used to play games and now just use iOS - it's partly a symptom of their own lifestyle being unmanageable. The smartphone and tablet have become the lifestyle accessories du jour among the highly stressed, everbusy technologist. They just don't have time (or won't make it) to do things that aren't "productive", like play games. iOS devices are great excuses to the technology workaholic, to dabble with entertainment while also "working".
The problem with the entire thing is that the biggest proponents of the mobile phenomenon seem to largely live inside a bubble of like minds and have little concern for what goes on outside it. Some appear to think that the people in their bubble represent the majority, or the only demographic that matters.
Perhaps there's a lesson here. iOS boosters look as silly to hardcore gamers, as the hardcore have looked for the last few years regarding the Wii. Hardcore predict Nintendoom every year because Wii has bad online, graphics 4 babby, and Mario Kart iz not cool like Gran Turismo, which is not babby game. Wii keeps selling, Mario Kart becomes biggest selling racing game of the generation, etc etc.