It would also remove the work force doing the construction.
Today I was in Bat Ayin. They do not permit Arabs into the gate, not to work and not to pass through. They do have some ongoing construction, now that the freeze is over, and because they are the only town with these strictures, they can find workers to do the job. But expel all Arabs from Israel, and the few Jewish construction workers will suddenly be stretched too thin. Construction will grind to a crawl, and the land will not be developed.
Once the Arabs are removed, unemployed construction workers from the US would be more than willing to work in Israel.
BTW, this reminds me of a Rodney Dangerfield routine.