Actually, there are two different things.
They do have existing laws to decrease roaming charges every year.
But the EU commissioner wants to eliminate them entirely, which would be a big change, to set up one mobile market across the EU. The politicians like the idea but the mobile industry may not necessarily like it.
This more radical proposal may or may not pass into law. The industry may lobby heavily against it.
Then there could be all kinds of unintended consequences.
The carriers make a lot of money on roaming fees. If they're abolished, their response may be to raise fees for other services.
Here's a better overview:
http://www.nytimes.com/2013/05...?pagewanted=all&_r=0