He'll have to be ready to risk the designated rookie extension, which will be over $200 mil to sign the qualifying offer, which is $17 mil. While $17 mil is a lot he'll only be able to sign a normal max contract after that and wouldn't be eligible for the supermax. He might make up the difference from commercials in a big market, but it's a huge risk for an injury prone player. There might be some rookie who'd do this eventually, but I doubt Zion would be the one.
The best thing such players could do would be to force a team to trade them during their rookie deals. If it gets to the QO players are at a huge financial disadvantage.
Fans of small market teams should hope these floodgates never open.