How does that leave any room for renegotiation if we stay in the EU?
I wonder how many times how the EU actually works needs to be explained to you in this thread before you understand? Juncker is not a dictator, the EU doesn't work like that. To get change in the EU we need to do the same thing we've always needed to do and Cameron is bad at - build alliances with other Governments in Europe and persuade them to support the same things we want.