The article points out that MS will still provide blocking tools for companies. Corporations are the major source of IE6 browsers and I'm not sure this will have any impact on them. The best we can hope for is that high consumer adoption rates will force many more sites to drop IE6 support which might spur companies to finally test and upgrade.
Educational institutions using certain testing software from a textbook publishers will probably block updates also. The problem is that, like a lot of enterprise software, the testing sites are fairly fragile and don't react well to changes in browsers. After getting into a situation where students couldn't take tests do to an update, most system admins curse at the sky and then block updates until given the go ahea…
There's not really a very good alternative to this-- Firefox has a history of breaking it's extension model with every major version, and Chrome is still in relative infancy (though I personally use it every day), so I think it's understandable that "enterprise" software companies haven't rushed to ditch IE for them.