The industry has always relied on a hiring pool that is willing to put up with untold amounts of bullshit for the privilege of working on games instead of CRUD apps.
I don't think this thread or any other social media is a good indicator of a company's ability to hire talent. Look at Google and Facebook. They get shit on constantly by online commentators, but they're doing pretty well and seem to have no problem hiring at market rates.
Google has a great reputation as a great place to work with most people in the industry. I think that is actually responsible for a pretty decent portion of their success.
People in the game industry who are any good have the ability to work for any number of companies in the game industry, Blizzards worsening reputation is going to mean blizzard has to do more (probably pay more) than those other companies to attract them.
Maybe related: See the criticism of their games in this thread. Potentially this is explained by blizzard having trouble employing people who can make them good games...