This is an impossible task. There is no way they will be able to enforce this. It would literally require them to stick their dirty fingers into every piece of software built in the EU.

They can attack large corporations like ISPs and such and force them to do certain things, sure, but there is no way they can "ban" any kind of encryption with any real success, because, as the OC said, it's basically trying to outlaw mathematics. Forcing ISPs to perform deep packet inspection or whatever won't change the axioms of mathematics or fundamentally alter computer science so that they can suddenly break encrypted data coming from their clients.