None of that is going to even be needed. A wall will stop a lot of activity which is currently harmful to both Mexico and the USA.
It’s a guaranteed great investment. The trouble that it will keep us from having from Mexico will pay for the wall. And as a bonus to Mexico, America will have to feed its dope habits some other way, and any remaining clandestine Mexican drug activity will now be for domestic (Mexico) consumption only.
These aholes in DC will drag their feet indefinitely. They need a fire lit under the a55es. The wall is non-negotiable AFAIC. One way or the other, it gets built and it gets built right and it gets incorporated as part of a broader overall strategy.