Basques have been able to protect their language pretty well despite being part of Spain for hundreds of years. I really, really, really, REALLY don't see why should they stop speaking their language now when they've been given all the standard minority rights.
SERIOUSLY, separatism in modern-day EU is so stupid it gives me pain just thinking about it. All EU countries are democratic and none is trying to oppress its minorities in some blatantly evil way. We could argue about the policies in Slovakia or the Baltic states, but funnily enough, none of the concerned minorities there are demanding independence.
It's almost as if the more freedom, money and rights some minority has, the more likely it is that some *** start demanding independence.
"Oh gee, we are giving too much money to the central government, that's oppression!!!" 
Yeah, right - so when we have a country with majority ethnic group X and minority ethnic group Y, in which there are rich as well as poor areas, then if the rich parts populated mainly by X people pay more than they receive, it's just OK, these are the rules, but if the rich part happens to have Y majority, it's suddenly not the same rules for everyone, but evil oppression and exploitation.
Riiiiight

With that kind of logic in my arsenal, I demand independence for Brno. Our GDP per capita is way higher than that of the neighboring areas - we don't want to subsidize these redneck hellholes, right? Oh, and also the EU should be disbanded immediately since the rich countries are subsidizing the poorer ones - screw that blasted Brussels and its oppression!