Cuban is first and foremost a businessman, and a practical one at that. He doesn’t want the door to even be cracked open a smidgen on this, as maybe someday the other owners would tire of his controversy and antics and try to force him out as well.
So no, they can’t force a man to divest owning a professional sports franchise. But they can and do have a right to condemn Sterling’s words and not want to be associated with him. There are other ways to make Sterling’s continued ownership tenure untenable, as the sponsors leave, the fans cancel season tickets, and no players will want to play for the Clips while he still runs them. He has a right to own his team and hold his beliefs, but others have the right to say “I’m not setting one foot through that team’s front door”.
I suppose they can do whatever they want.....but I am leery of those who take action merely because of what someone says.