NBA has a salary cap though. Miami can still play with Bibby and all their current roster next season if they want to.
I don't think it's any secret that this team isn't sustainable and half of them won't be around after the finals, that's kind of the point. He has more than double the salaries of any other team and even triple some of the ABBL team salaries now. Kind of defeats the whole purpose of strategy, planning, training, even playing at all etc if someone is just going to buy the championship at the end of the season.
The only upside is that all that money he hoarded after tanking a season HAS to be just about gone by now.