Also, cutscenes sell, they make for trailer videos and nice screenshots which all helps market the game. Along with that as graphics have improved the newer generation of players has become a lot more obsessed with how a game looks over how it plays. Hell just look at the threads on this forum and look at all the times people talk about a games looks rather than its gameplay, we even have an enormous thread dedicated purely to a games looks, but no similar thread for gameplay. I've even seen people often say that they won't play game x because of its looks, sometimes missing out on some awesome gameplay. Imo , games will continue to get "smaller" and more linear as more effort gets placed into appearances (as appearances create the wow factor that sells) than on longevity , replayability and depth.