I'm sure there are comparisons available, but I think the key issue is that European carriers have enough on their plate trying to fend off the likes of FR, EZY, etc., without opening up a new front. It's not the "majors" they need to worry about; it's the likes of Southwest, Jetblue, Airtran, etc, which are not only a lot more efficient, but can move a lot faster. So, the danger is that a European carrier could go to all the trouble of setting themselves up, marketing etc, only for a low cost like Southwest to come in and make mincemeat of them. And where would they base themselves? A major city, to which they fly internationally, which isn't already a hub of a major carrier or which isn't coveted by a low cost carrier. Let me know if you find one!!
To cut to the chase; winning this concession would only be equalled as a disaster by some European carrier actually using it.