The AFL haven't taken a side yet, they are "considering their position", whatever the hell that means, probably whatever the AFLPA wants.
I'm not against the AFL saying to players that if they want a career in the game they must be fully vaxxed. Effectively its a career in the AFL with vaccine or find a career elsewhere. Still not forcing them to get vaccinated, but forcing a choice.
As you say, it's possible that players deliberately choosing not to get the jab may find their lifestyle and career very limited regardless, especially if it's a condition of entry to some states.