the Junckers, Schultzes, Timmermanses, etc. do not fault the bureacratised and ideologised EU but blame Cameron for calling a referendum in the first place.
I'd be very much surprised if they did otherwise. Calling for referenda or calling the bureaucrats in Brussels to listen to the voice of people has been conveniently dismissed by them as "democratic populism" so far. If you don't know what I mean, just remember the British gang on the PF calling the results of the latest election in Poland an "18% democracy" or something like that. Now this "democratic populism" has slapped Brussels in the face.
Getting down to a deeper level, there are simply too many people on a relatively small island such as Britain (and in England in particular). However loudly the libtards (including the libtards on the PF) may praIse immigration, an ordinary man-in-the-street of the UK feels that enough is enough and believes that the continuous inflow of people to the UK will be better controlled if the UK is out of the EU than if it is in. Another matter is whether the goal to stop people from coming to the UK is achievable at all. But maybe despite the fact the Roman Empire didn't achieve that, the tiny remains of the British Empire led by brave Cameron are just able to do so.