If Israel is even vaguely serious about promoting peace and prosperity in the Middle East it now has a golden opportunity.
With the Syrian civil war dragging on at the cost of thousands upon thousands of civilian lives (many of them children), and the apparent use of chemical weapons by Syrian government forces any excuse for International inaction has evaporated. Although the US is talking tough it is hamstrung by geopolitical considerations in a way that Israel is not.
If Israel were to militarily remove the Assad regime from power in Syria (and then immediately and unconditionally withdraw) it would certainly be seen as a sign of good will. From such a positive high, negotiations about a Palestinian state might finally get somewhere. Israel has always been quick to act in its own perceived self interest. If it would act on the behalf of others it could be a game changer in the Middle East!