This is so awesome . If Trump got up and said "sorry, guys that was just a metaphor i wasn't actually going to build a wall" he'd gain 50 awesome points from me.
From the beginning, engineering and geographic experts have said a continuous wall on the southern border is not feasible - not physically or economically.
A non-continuous wall might help minimize illegal trespassing by funneling people to it's openings, but it follows the old saying that a chain is only as strong as it's weakest link. So any non-continuous structure will only make "porous" a little less porous. But if you're looking for a water-tight seal, "less porous" doesn't cut it.
What might be a more feasible approach (as part of a multi-pronged approach) is to completely reform the immigration system: clean up the bureaucracy, inconsistencies and clogs - it is an extremely messed up, complicated and overwhelmed system that constantly makes mistakes which destroy people's lives.
Establish fair laws that are applied & enforced consistently. End the anchor baby stipulation while expediting the processes to gain legal citizenship. Develop incentives (such as serving in the military for say for 2 years) for expedited legal citizenship. There are tons more things that could be done to repair the system which would help the overall situation of illegal immigration immensely.