"so Isreal might just wind up showing them Oppenheimer's Light."
Yeah, that didn't happen in 1973, and I very much doubt that it's going to happen now.
In 1973 Israel and a number of its Middle East enemies were at FAR more even parity force and capabilities wise. The Arabs had very strong backing from the Soviets, who flooded weapons into Egypt, Syria, and other participants. That showed in just how badly Israeli tank and air assets were mauled early in the conflict and it was touch and go for Israel for a couple of weeks.
Now, basically, there's no one to really bulk up the Arab states except the United States. The Russians certainly aren't capable of it and I sincerely doubt that the Chinese are going to do it either, given that they're really not on cozy terms with much of the Middle East.
Syria's still in the middle of a nasty civil war, Egypt is a *expletive deleted*it show, Saudi Arabia isn't going to march off against Israel, Jordan is stable but its military capabilities are minuscule compared to Israel. The wild card is, and always is, Iran, but their ties to Hamas took quite the beating during the Syrian civil war and they're still not on the best of terms anymore.
At best, the Arab states will provide Hamas with shadow aid and outright humanitarian aid, but none of them are going to start troops to the bored. They've played that game multiple times before and they've gotten nut punched every time.
