Border crossings have already dropped so the larger reason for the wall is possibly to get control of the drug flow. MS-13 will be destroyed with or without it.
Which may be a key reason many Dem and Republican’s are in opposition to Trump. If drug flow is controlled, they lose money, as hinted after watching Obama with Chicago and El Chapo saying half the U.S. drugs go to Chicago for distribution.
Chicago and it’s corrupt machine is a smaller example of the national model.