Heh! A wall will not work because governments run the wall.
Instead of hoping that a wall will work, you create a deterrence instead. You do this not through a governemnt solution, but rather by using the free-market to solve an issue. (kind of hypocritical, as free-markets prefer open borders)
Anyhow, this is what you do.
You declare the US side of the US-Mexico border a "free fire zone".
Anyone caught in this zone who is not a U.S. citizen can be shot on sight, but NOT taken prisoner. You either let them go, or you shoot them. Kind of like "catch and release"...Now, to prevent fire from going into Mexico, we'd have to back off from the actual border a few hundred yards at the least. I understand that both the government and private citizens own property on the border.
This is where it works out perfectly. All the gun-nuts in America can finally get a chance to turn their justifiable homicide-fantasies into reality by volunteering their time to be snipers on the border. Wouldn't be "volunteering" per se. More like going on a hunting trip, except for invaders of this country.
Ranchers and property owners on the border will make a lot of money by being able to sell hunting guides and access to their land. You could pay $1,000 for 5 days of lodging and access to a ATV to have your own exclusive access to a few miles of border. Others can just sell a certain number of tags per lot of land. The local border communities would prosper and boom (pardon the pun). Would create a massive new border economy.
People will get out there with all their $4,000 fancy sniper rifles, camo, ghullie suits and other "soldier of fortune" stuff. Would be fairly crazy.
Simply appealing to the homicidal nature of most Americans would be enough to create plenty of border security without ANY cost to the government. That's right! Not a single tax dollar wasted. Why create an expense for something people are willing to do for free? Or even pay a small license fee? Right now, most people don't want to be "Minute Men" how boring. Walk around with bottled water and flashlights! yuck! Tell Americans that they can actually discharge firearms at invaders and demand will soar!
Now that would get people out there!
The Border Patrol agents will no longer need to catch invaders, instead, they will become "game wardens"..and keep the civilian border protectors in line (have to have rules you know)...
Basically, there would have to be a licensing process. Anyone interested in this hunting license would have to agree to a number of special terms, as well as sign a number of waivers. That part would be a little complicated. Like no 12ga shotguns as their use would be inhumane when used at long distances. The use of hollowpoint or fragmenting ammo is a must, no non-fragmenting or non-expanding FMJ would be allowed. .22 caliber centerfires would be OK. Night hunting would be permitted...but only if the armed hunter has an individual night vision device. Poaching would be severely punished, ie.. no women and children.
BTW, I'm not serious. I think that is kind of sadistic. But this thread is already silly to begin with.