All true, but I don't think this situation is caused by casual market, if ever casual market is usefull for big companies, to finance other games, and for samll companies to grow.
The main problem imo is the developing cost of games which has increased too much, so companies don't want to take the risk anymore creating new IPs when it's easier to sell a well known product. This is also the reason why imo games are too short nowadays. The economy crisis is also not helping, any company in these days is less inclined to risk (not only gaming ones).
In the end I think that,while the average quality of games has increased this generation, the quality of top-games has decreased. In the last 2 years I had more satisfaction palying older games that I have originally missed than playing new ones.
