The idea that the European commission will contemplate a revision of EU competence is sheer clap-trap on the part of DC, who is a deckhand on a ship heading westwards towards the East, direction "single European state" (see "the world is flat").
In fact it's not flat, contrary to the misguided views of the muttering deckhand arguing with the captain (Jose Barroso leader of the European commission).
The captain of the EU ship has flatly ruled out any repatriation of sovereignty to any EU member state.
"Any fundamental discussion about the renationalisation of EU competence 'was doomed to failure', Barroso said."
http://www.telegraph.co.uk/news/politics/ukip/10355351/Nigel-Farage-Tell-the-truth-Mr-Cameron.-Your-EU-strategy-is-doomed-to-fail.html