The Gaza war forced regional players to take sides. Egypt, Jordan, Saudi Arabia and all the Gulf states but Qatar gave Hamas a cold shoulder. Hamas is, after all, a Sunni Arab movement that turned its back on its brothers to embrace the feared and loathed Shi'ite Persian foe.
A tacit if grudging alliance is emerging between Israel and pro-Western Sunni rulers. The prospect of an Iran fomenting Islamist revolutions, wars and insurrections around the region under the cover of a nuclear umbrella is infinitely more terrifying than a Jewish state in the Arab heartland. The Arabs need Israel's steel against Iran today.
The Strategic Importance of Israel's Gaza Operation -Isaac Ben-Israel
Previously, it appeared as though the weak side (Hamas, Hizbullah) could attack Israeli citizens uninterruptedly, while Israel hesitated in utilizing its substantial military power.
The recent [Gaza] operation showed that even mosques used by terror groups are no longer off limits for Israeli military power. The operation's diplomatic achievements include destabilization of Iran's protege in the Mideast. Moreover, most of the Arab world stood by Egypt vis-a-vis Hamas. This recognition of the common interest with Israel against Iran and its emissaries holds immense strategic importance.