no one expects it to stop 100% of people. but hoards wont be walking on through anymore.
Hoards don't walk through already lol. The majority of illegal immigrants enter our country through overstaying visas or being smuggled in by coyotes.
Might make it a bit harder for the coyotes to do their job, but they'll manage. Expect a drop until the first tunnel is built.
If we really want to solve this problem of illegal immigration permanently, there's basically two options. We can either cease the subsidization of our agriculture and compete fairly in the market, or we can offer citizenship to undocumented immigrants. The first option will likely never happen because politics is dominated by special interest groups, so amnesty seems to be the most realistic option.