It is true that a west-bank-gaza state is unfeasible. Muslim power structures hinge on topological contiguity as they are based on segmentally fused extended families. This would not even change if Hamas would conquer the west-bank. So far there is really not much to be gained from waiting for the PA. The problems lie in Gaza itself. The Europeans will not come, unless they are at least acquiesced by Hamas in the first place. But Hamas will not tolerate anybody who precludes them from getting armed. So negotiations will be made who's outcome is ambiguous enough to have it both ways. If Hamas is smart they will accept because there's another asymmetry to be gained from. If they make troubles the Europeans will look the other way, if the Israelis make troubles they have some additional human shields and a Europe that is even more interested in "peace". The flaw in Avineri's article is very easy to discern. He wants to dynamize the system by inviting a third party to the stage. But such games only work if the third party can add new functions to the game. They will, but only to the detriment of Israel. When it comes to the point of normal interstate relations, mainly refrain from violence, Europe will not be willing to structurally substitute Israel and this would be the whole point.
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from the article: Disengage from Gaza once and for all