I've been skeptical about "the wall" since it was first proposed.
any wall that's successful would be obsolete upon completion. we already have "very high" fencing in several areas.
here's what would be more cost effective an easier than a wall:
- change the penalty for knowingly hiring illegal aliens from "fines" to "mandatory jail time". watch how quickly the hiring dries up
- deploy the national guard at "popular crossing locations"
- jail the guides/mules accompanying the migrants
- forcibly return undocumented migrants THE SAME DAY, after fingerprinting, photographing, an obtaining a DNA sample. issue a written warning that a repeat violation will permanently bar them from any future visa or citizenship
- Amend the constitution to stop granting citizenship to random foreign kids whose mothers give birth in America. this isn't just a problem with mexico. the Chinese, arabs, and other nations are pulling this stunt now. most nations don't grant citizenship by virtue of where you're born any longer.