Other posts refer to what I'm saying, but are dismissive and not-descriptive, only saying "serious gaming".
When my wife first got her smartphone last year, I optimistically looked for games. The RPGs(that's mostly what I play) I found are about the level of old SNES games. My taste in games has changed in the past 20 years. While occasionally, I like a game like "Cthulu Saves the World"(done in that style), games like Fallout are more to my taste. That level of graphics isn't coming to smartphones soon. I don't know whether they could handle the AIs in Fallout, but I REALLY doubt they will be able to handle the AIs of a game like Civilization 5.
If RPGs suddenly all were at the level of SNES games, I'd read books a LOT more. And, I've not been impressed by e-book readers. Used books are cheaper than new books-all e-books are "new". AND you have to pay for a reader. I wouldn't worry about dropping a paper book. While, I don't like getting a book wet, that would be more the case for an ebook reader. So, ebook readers aren't moving ME toward "post-PC" either.