Lol no dude. You are wrong. Lots and lots of companies people drink during core business hours. I am talking beer or wine at lunch, or beer mid to late afternoon....I think your implying someone slamming shots at work and being non functional or having an obvious problem.
Riot built a freaking bar (which they use as a coffee bar due to liquor license, but I believe they finally got that and have draft avail). Apple hosts beer bashes, would have mid day wine and food for launches, etc....at Google we had open bar events. Fidelity Investments for gods sake would have liquor baskets...again, this is during business hours.
I don't know what circles you run in, but having Alcohol during a work day is definitely, definitely not taboo. Getting smashed at work, that is a different story.
My experience, the bigger the company the more they drink.
I guess there are zero serious companies in Silicon Valley. Bottom line, alcohol is not what's killing Blizzard. Nor is Blizzard dying. Its changing culturally. Lots and lots of studios would trade places with Blizzards portfolio and financial status right now. They are still highly successful. That said, you WILL see lay offs as their numbers wane because they have a bloated staff.
To reiterate, Blizzard is changing culturally as we as a society are changing culturally. Period. There is nothing happening at Blizzard that is not happening at a million other companies. This is not unique, new, or different.