Here is another thing that it will do. Illinois started allowing gaming machines in bars a handful of years ago. A lot of bars were already paying out on their "for entertainment purposes only" machines for many decades before it was technically legal. The law changed and all of the sudden every bar in Illinois has a handful of machines and rakes in thousands a month because people aren't worried about getting caught.
Right now there is a ton of money circulated under the table to recruits and players. This will make a lot of it come out to the light. Guys will get $10,000 for a "commercial" when in reality it was just a pre-arranged deal to go to that school. After the new rules are passed or legislated into existence, there will be a lot more money out there that coaches and/or boosters were too scared to offer in fear of getting caught.