It's not just Blizzard that's changing. The entire AAA video game industry is imploding, with a few exceptions of course. I believe there is gonna be another crash like the one we had in '83. The signs are all there; lack of innovation, predatory monetization tactics, releasing incredibly buggy and unfinished products, Ivory tower syndrome, graphics and wow factor while game play takes a backseat, single serving gaming mentality (mobile gaming), alienation of core fan base and damaged reputations.
Companies that actually care to craft products of superb quality will come out of this ok, others are gonna fall far from grace (already happening). Indie and AA games will get the lions share of the "gamer" market in coming years. Indies are already on a massive upswing while AAA games are having increasingly poor numbers (there are a few that continue to grow and are exceptions).
This is just my honest opinion about things and in no way to be taken as facts. Research this on your own to come to your own conclusions.