That's the thing, they haven't left yet nor have they even formally invoked the applicable section of the treaty to do so. Obviously Cameron's position was, "fuck off, I'm not going to do it." So you have a non-binding referendum which needs to be enacted by a government which seems lukewarm at best to the prospect AND, the rabble-rousers who pushed for it are gone. Meanwhile the uncertainty it created is most definitely real and the consequences of that are even more real.
The term in the US is "clusterfuck."
The term in the US is "clusterfuck."