If OBL wins, there will be consequences for many countries besides Saudi. He is an Islamofascist fanatic and a dreamer, and he wants the map back the way it was 1100 years ago, when Spain was mostly Moorish (al-Andalus, they called it -- OBL goes on about the "loss" of Spain as if it were last year), and the caliphates were vigorous from the Atlantic Ocean to India.
If he wins control of the shrines of Islam, he'll go after Israel and the West next, and I would expect him to use oil, WMD and terrorism. Everything, in other words, in order to inflict a decisive strategic and moral defeat on the West and destroy the prestige of European civilization.
That's what really fries his grits -- the association with European civilization of the prestige of leadership in so many of the arts and sciences, in engineering, and so on. He can't stand that -- it's like blasphemy.