Yowza. This surprises me. I thought Ev was interested in running the company and building a legacy, but this looks more like a plan for a big exit.
I'm quite sure this is what happened. Here's a detailed breakdown from Shervin Pishevar on how SGN did practically the same thing.
http://www.quora.com/Is-it-true-that-Shervin-Pishevar-is-out...
I suspect you got so many downvotes, though, because of the dismissive tone of your comment.
'New Twitter was definitely a trigger for this,' Williams told me. 'Conveniently, I took over the CEO role just about two years ago - and brought Dick in just about a year ago. I’ve always thought of myself as more of a product guy, and New Twitter seems to work out well,' he continued. 'New Twitter was a moment of clarity for all of us here,' Costolo added. '[With this change] Ev can once again focus on product.'