I know some former PC gamers who turned to smartphone games. Actually, I'm one of them. I wouldn't even consider consoles as an alternative to PC gaming, but smartphone games are another story. PC games market is largily dominated by a few big players, who release big titles for broad audience to maximize their ROI. Naturally, their games are developed for the lowest common denominator. However, in smartphone game dev there's still a place for indie developers, who can afford to develop a game they'd play themselves, sell it for a small niche and still be profitable.
Not all of smartphone games are timewasters (well, no more than any other computer games); there are even some complex RPGs, like Zenonia for iPhone. While not as deep as the legendary Fallout, it is still much more of an RPG than many "RPG"s, released for PC nowadays.