I wonder if Israel has made it clear they would nuke mecca if this happened?
They won’t do that. What few civilized people that are left on Earth are too civilized.
I'm pretty sure the Saudi's know that is a given. Any WMD going off in Israel will be followed very shortly (weapon prep, load, and flight time) by Mecca and Median turning into self-lighting glass-topped parking lots that will be safe for a pilgrimage in say 10,000 years or so. Guess until then Muslims could simply look up to the stratosphere and pray to the dust...
That's one of several reasons why I see Israel and Saudi as reluctant but necessary partners in putting an end to Irans nuclear ambitions. Neither one wants them to have the bomb.