There's 1 huge difference (well 2, Ronaldo acted like a ****) between the Ronaldo situation and Fabregas'; Real had the money and were willing to spend it on Ronaldo where as there are doubts over whether Barca have the money or whether they're willing to pay the sort of fee Arsenal will want.
While it's plausible that Fabregas will be allowed to leave next summer, it's far from certain.
While it's plausible that Fabregas will be allowed to leave next summer, it's far from certain.