Sure, but according to the article Gabe only owns about 25% of the company, so conceivably if MS throws enough money at them, surely enough people will vote in favour. I certainly hope this never happens, of course.
according to the article Gabe only owns about 25% of the company
The source for that number is the same Xitter that made up the rumor in the first place:
Insights from Dior, a prominent figure in the Counter-Strike community, reveal that Gabe Newell owns less than 25% of Valve.
Valve is not a public company. Unless Dior is on the board of Valve, or know someone who is, he doesn't know the makeup of the ownership structure. Wikipedia cites a Forbes article that says Gabe owns "more than half" of Valve, although that article was published in 2011 so it's possible that's changed.
Thanks for pointing this out. It looks, from other articles, that this rumour is completely unsubstantiated anyway so I guess it's a moot point. Now that I think about it, 16 billion seems pathetically low for the money-printing machine that is Steam.