Or they'll go to GMRS/FRS, MURS, CB like they do now. There are not a lot of unauthorized users on amateur radio bands because the chances of getting caught are much greater. You and you're family can't illegally get on repeaters every day, for example, and conduct your business, because you will get caught. HF? Simplex? Much easier, but for the most part, people don't do it knowingly.
I have a security company near me that uses ham radio frequencies illegally. The only reason I found them is because they are using simplex on the output of a repeater I use, and I turned the inbound tone off to do some troubleshooting. That's when I heard them. I'm sure they're using some eBay radios or Baofengs or such that just happened to be programmed to that frequency. I highly doubt they decided that they were going to use ham radio frequencies illegally because they couldn't past the test or whatever.