One thing that will be interesting to watch in all of this is how the NHLPA responds to any action the NHL takes. Clearly the NHL thinks it has some ability to do something, given how Bettman stated Mitchell Miller is ineligible to be signed after Boston signed him to a contract and "I can’t tell you that he’ll ever be eligible to come into the NHL." The NHLPA has never stepped in to defend Miller for that, though that could be because (1) he was never under contract prior to Boston signing him, and (2) his rights weren't even held by a team prior to Boston signing him, to the point the NHLPA had a potential interest in the player's future interests wrt the NHLPA.
It also raises a question of what duty the NHLPA has to defend players currently with NHL contracts (or who were under contract but have their rights held by a team) for actions that occurred before signing an NHL contract. Or, what duty the NHLPA would have to defend a player who signs an NHL contract, has never played in the NHL (or even in the AHL) but was instead assigned to major juniors, and then commits an act the NHL deems worthy of discipline.