The Arabs should pressure Jordan to take in their people.
Maybe Jordan (and/or Egypt) will be signing the agreement too, even though they already recognize Israel.
There could conceivably be a deal down the road for Jordan to possibly take some people and/or land - maybe Egypt could take Gaza (the current Egyptian Government would rip out Hamas by the roots). If 2024 rolls around and the Palestinianreps can’t work their own deal, maybe the region will give up on the two State approach.
Maybe the Saudis could hire a bunch of Palestiniansto work in their new city of Neom.