I don't think this will follow long term. The lack of predictability of the "casual" market is mostly a consequence of their newness.
In the late 70s / early 80s, as today's "core" market was just being formed, we also saw a lot of churn and a huge amount of unpredictability. Companies like Collecovision, Intellivision, Sears, and of course Atari rose swiftly and then collapsed in to nothingness. As time has gone on, however, companies have figured out what people want and the market has become more solid and more predictable. Churn slowed. Sega was the last real victim, and since that point we've had the same 3 major competitors for nearly 15 years. The market is now highly predictable and very solidified.
Most markets start out this way. The market for soda was not always just Coke and Pepsi; it gradually solidified around them over the course of decades. We can see the market for Android phones gradually consolidating around winners (especially Samsung) right now.
I think you're more in tune with innovations inside genres you already like or are already familiar with. The differences seem particularly pronounced and important to you, similar to how small changes in the sound of a band may seem like a huge departure for a fan of the band but may sound identical to someone who isn't.
That doesn't mean that the genre didn't change at all, mind you. It did. I'm only examining the long term economic trends here.