In El Paso of the eighties, affluent ladies who wanted maids at starvation wages had to fear having their pretty little cars confiscated when they drove maids around.
So embarrassing for the white ladies. It kept a lot of them from breaking the law.
Don't you think it is odd that this aspect was not part of the plan. There was no mention of penalties for not using the "new" work visa's. So therefore I contend that illegal workers will continue to work as illegals to avoid having to pay Uncle Sam while the new visas will be used for higher paying jobs that typically require a work visa.