Things change. Unless the world stops tomorrow, Arsenal will have ups and downs and we'll have more Fabregas' and Bendtner's.
Fabregas has had some brilliant moments but has also shown himself to be a flawed player many times. If he's great at Barcelona, it will be great to watch.
If you want to see it as the end of the world, that's fair enough. I'm not going to be that dramatic about a player who didn't give a fuck for 18 months.