its still the "hottest" market out there at the moment - so you can make good profit if you do it right. the only problem will be, that the big studios (ea...) and casual game portals already have their own experienced teams working on lots of games -> so the market is already starting to saturate pretty quick.
also a lot of middle sized teams working on aaa games in the past start to refocus on casual games. you almost cant reach their quality and efficiency as lone gunmen ehrm developer.