Our (Dutch) government will never hold a referendum because our government isn't ruled by a single party.
If we had the Neo Nazi group (PVV) as a single party ruler then we would leave the EU without a referendum (probably) but since the Dutch election system semi prevents having a single party ruler it's highly unlikely that the PVV will find a friend that will go along with them.
Which is fine since the government needs to represent everybody (and that includes bloody immigrants and minorities), and not just the group that just want to see the world burn.