well santa monica makes fat princess so they can easily make good games without it being God of war.
but everyone has to remember that kojima said it was the end of MGS once part 3 was out and well obviously they were just trying to trick us.
also kojima may have not made a sequal to MGS4 (yet) but they made another game about a corresponding character to MGS (Metal Gear Solid Rising)
all in all im not saying there will be another GOW but that there's a chance that there lying to us just as kojima did.
or they can make another God of War game based on some one other then kratos like a son or that hero they found in the temple.
you also have to remember that kratos had a brother that hates him and wants revenge on kratos for "leaving" him.
in my opinion the chances of another God of War are pretty high so lets just wait another 2-4 years to see what happens.