What is not a success is:
- The EU taking retaliation against them,
- The EU parties overturning members of the Leave party into the Libdem, AFTER being elected (yes, it happened for 16 members, plus the ones who didn't officially switch but stalled the Leave party's proceedings),
- From the moment they clearly voted NO, it took 3 more votes until they could be allowed to leave. Basically, it was until it was clear the UK citizenry would be entirely blocking the democratic process until the EU-Leave decision was enacted. You can understand people's despair of democracy when a clear LEAVE vote isn't enacted, like in France 2005.
In the rest of the EU, they're too chicken to let us vote. But they will let us vote... one day... only in areas where they're guaranteed a large STAY result.
The EU is only letting us vote when the answer is Yes.