Nope. I'll play these for as long as they keep coming out.
Also, it doesn't really make sense to commit to quitting the series after 3 if it's still going strong. What if the first game of the next saga comes out 16 years from now and it's getting perfects reviews across the board and its named GotY and somebody's all like "nope me and KH broke up after 3 came out"? Besides, i doubt Nomura is gonna leave us with all the loose ends tied up here. If you quit after 3 those lingering questions will haunt you to your grave.
Also, it doesn't really make sense to commit to quitting the series after 3 if it's still going strong. What if the first game of the next saga comes out 16 years from now and it's getting perfects reviews across the board and its named GotY and somebody's all like "nope me and KH broke up after 3 came out"? Besides, i doubt Nomura is gonna leave us with all the loose ends tied up here. If you quit after 3 those lingering questions will haunt you to your grave.