Gonna tell you why it won't happen first of all to a 18 years old poor kid the current dleague salary is good money to play basketball. Plus lottery style players the first really good pay day isn't ur contract it's it first endorsement deal meaning you need to be seen u need to have a name nationally. You cant get that in the dleague u can get a name in college. Now finally big money has always been there straight out of hs if you go to Europe. Plus how do you even do it you can't just have a top hs player say I'm going to the Lakers farm team. And then the Lakers basically have the rights to him. Would have to have alot more rules put into place. So if this goes to 2 years then I see no problem.
The teams will draft them out of high school like the MLB does. It's all going to depend on the money and how soon they let them negotiate their second contract.