Turkey is like a nervous prospect to a biker gang who's about to jump all over the random drunk guy at the bar for harassing the club president's old lady, lol.
They have a lot to prove. Everything Erdogan has done since he's come to power has been a big appeal to EU membership. The UN and Obama have been in constant contact with Turkey's leadership all year, strongly urging them to take the lead on diplomatic pressure in the region against Syria. Obviously it worked, since Erdogan has been the loudest voice against Assad for months, and now they're showing pretty clearly they won't accept any spillover violence, either. Will it get Turkey what they want, more favorable consideration from Europe? Maybe, maybe not. Either way, I'd say it's a good development. Not what's happened to Turkey, but the way they are reacting to it and becoming a positive force in the region. This is the kind of rare diplomatic success that foreign policy analysts always claim is possible, and cynical isolationist ideologues always claim is not.