"That would be catastrophic to Israel: they could face Iran from the air and Arab ground forces from multiple directions. "

Israel has little to fear from Iran in the air, the IRIAF has been destroyed and ballistic missile launches have tapered off.

In terms of Arab ground armies, only Egypt and Saudi pose much of a threat; the others are small, unintegrated and inexperienced and rely heavily on Western contractor support.

And if Israel, which has the most combat experienced air force in the World, somehow did struggle to defend against those forces, they always have the Samson Option of nuclear-tipped missiles from silos and submarines.

> ...they always have the Samson Option of nuclear-tipped missiles from silos and submarines.

At which point Israel is over. I have no doubt about that.