I think you are right on the money. The sales data certainly indicates this too. Gamers are buying fewer games for their handheld gaming consoles with both Nintendo and Sony seeing a drop in digitally purchased and downloaded games as well as physical copies of games. All handheld gaming console sales dropped a reported 27% from Quarter 2 of 2013 to Quarter 2 of 2014.I think eventually, mobile devices that are purely built core gaming will be a thing of the past. With smart phones and tablets getting meor and more powerful, I can't see the point of carrying round another device strictly for gaming.
Sales of hand held consoles has already taken a drop and I can see this trend continuing.