As I recall we've been through this once before.
A steel/concrete Israeli wall would destroy the economies of the 15 border counties by closing off ranchers' and farmers' access to the river's waters,
That's why the Israelis don't use a "steel/concrete Israeli wall" on the Israeli/Jordan border.
They will be soon. Last I heard it was in discussion. ISIS/Hez/Hamas/Iran changed the game. The great wall of china does not seem to have a negative impact on trade with china after 3000 years.
There is no excuse for no fence/wall from the gulf to the Pacific. NONE.