A meeting's productivity is inversely proportional...
to the number of attendees. Given a meeting of that size, it's doubtful they'd ever come up with any real proposals. Still, unless Israel has reason to trust the process, there's little chance any good will come from the meeting. It'd almost be fun to watch the Europeans actually try to find a solution that both sides can accept. In all probability, it'd be a rehash of the Munich Conference with equal results.