Not surprised in the slightest. Let's just hope that not all every penny coming in from mobile games go straight back into making only more mobile games. As a secondary source of income for gaming companies (and one with much higher profit margins), I think it's somewhat fine though (even though most games are terrible and there are a lot of really horrible business models out there).
Companies sustaining themselves entirely on mobile platforms are not a good for the industry though, they represent a movement and direction I'd rather not have as a huge influence in gaming.