Me personally?
Or the german engineers who built the tunnels they find so many of that there's a task force of dedicated agents in San Diego to find them and destroy their use and who are so experienced that they were able to tunnel like 2 miles to the shower stall of a maximum security prison and take a cartel boss out of there on a motorcycle on rail through a ventilated tunnel complete with forced air circulation and fully operational lighting and electricity.
The people who cross the border using coyotes as guides and pay human trafficking ring to cross them, get them to the safe harbor of a stash house, and arrange for their transportation out to strategic areas throughout the country - in many instances they're already set up with jobs through a network of people that operates in tandem with the traffickers like a temp service that fills jobs nobody wants and steady keeps the people coming in pace with turnover (like hookers that run away or strawberry pickers who get maids jobs). It's already a vertically integrated logistics agency that deals in moving people illegally and there's plenty of money to change their methods of transportation/arrival if business get interrupted with a wall.
The engineers they hire or force to build these tunnels will go under the river with ease if they're asked to, and provided with the necessary funds, manpower, and time to do so.
There's tunnels under the ocean, dawg. The only obstacles are time and money and they've got plenty of both, and the motivation to get the task accomplished. Their services will only become more in demand as we tighten the border, and it will only give them a huge boost in power and prestige. Don't be naive.
Nothing will change. If anything, things will become more organized and focused, as we force the amateurs and Mom&Pop traffickers out of the game. But these people will get in without issue if they want to no matter what, and we depend on them to. They fill a valuable need we have, especially with unemployment so low - Americans are not working in manual agricultural jobs with 2% unemployment levels, these people will and are.