Professor Gavin Barrett:

That is undoubtedly the case. Indeed, I would be most surprised if their powers were not extended in the next treaty revision. I fully expect a broadening of the range of issues in which national parliaments are expected to engage. The European Union needs as much democratic legitimacy as it can get its hands on. Moreover, the European Parliament has been given as many powers it can have. In fact, it has powers that make it almost the equivalent of a national parliament at European level. In terms of parliamentary developments, there is only one way for this to go, and that is increased powers for national parliaments.