You've neglected to mention Black September.
And the West Bank WAS part of Jordan from '48-'67.
It was also part of the Ottoman Empire c.1550 to 1918, and of the British protectorate 1920 to 1948. So what?
While there are ruling families/tribes, and jealousies between others, there exists no one tribe - one country rule in the Arab world.
I was speaking broadly. Evidence suggests that the Sunni-Shiite animosity is worsening, that tensions between Arab and non-Arab Muslims are worsening, that Lebanon is coming apart again, that Egypt and Iran are in for some very rough times. And, of course, Iraq is in the midst of a combined civil war and occupation.
Black September expelled the fedayeen; it's implied in my response. The great majority of Palestinians remained and still remain.
The significance of the West Bank being part of Jordan in the near past, willingly on Jordan's part, was in response to your citing huge obstacles to it, coming from Jordan, in the future.