That's not what is going to happen.
Were VERY close to solving the Mexico-US border issue.
What will happen is robots will take over low paying and menial jobs. Robots will run the supermarkets, restaurants and shopping malls. They will also replace migrant workers when it comes to basic hard manual labor like gardening, simple construction projects, movers, etc. Robots will UNDERCUT migrant works in the US. Migrants will have no choice but to return home to find work in Mexico. In fact, we are projected to see REVERSE immigration after 2025, as illegals in the US fight to cross the border back over to Mexico to find work.