I might be the weirdo, but I never fully bought into the mobile gaming market. It's very rare that I'm not close to a computer and I have the opportunity/inclination to play video games.
- 77% US adults currently own a desktop/laptop computer (interestingly, this seems to hold mostly steady since 2008)
- 85% US adults own smartphones
There is no "only own a smartphone category" in the data. There is a "relies on their smartphone for internet access, with no broadband internet". This one is just 15% of adults, though slightly higher in the 18-29 age group.
I can't see anything in that link that would support the majority of people using only a mobile device.