Once I was discussing alternate history scenarios with a friend (with whom I have no contact any longer) and I remember something being said on the following scenario: Byzantine Empire "survives", keeping its western Turkish territories plus Greece, Bulgaria, Cyprus, anyway, pretty much Southeastern Europe, while the Ottoman Empire expands itself to east and south much like IOTL, but leaving the European territories of Byzantine Empire undisturbed.
Would it be plausible to have such an outcome after the infamous year of 1453, in a way both survived through Renaissance, Enlightenment and Neocolonialism?
If the answer is "yes", which PODs would it take to happen? Would it last?
If the answer is "no", why exactly?