Avraham Burg, former Knesset speaker and former head of the Jewish Agency says “to define the State of Israel as a Jewish state is the key to its end. A Jewish state is explosive. It’s dynamite.” In an interview in Haaretz Weekend Magazine, he said that he is in favor of abrogating the Law of Return and calls on everyone who can to obtain a foreign passport.
I would also add that defining Lebanon in terms of a confessional state is also (one of) the key(s) to its end. But as to whether the major players care depends on the losses or gains that will come their way.