There no basis for a lawsuit and it won't happen anyway.
(1) Since players could not reach a final agreement during this time, there is no basis for such a lawsuit. If you can't reach a binding final agreement due to the league rules, you can't sue on the basis of NOT reaching a binding final agreement.
(2) Even if Dallas had a decent case, Dallas would have a much harder time attracting future Free Agents if they sued Jordan. It would be counterproductive in the long term even if they won.
(3) It would be frowned upon by the NBA and the other owners. While Cuban doesn't care if he gets fined $50k by the commish, he will care if his suit somehow threatens the profit stream of the other NBA owners.
(4) If they sue Jordan, how much of a disruption do you think he'd be on a team that he didn't want to be on that sued him and forced him to appear. $80m is enough "**** you" money so that he could dog it, be a disruption, get paid and not have to worry about his future. If Vin Baker could collect all of that money from the Celtics while he was a drunken bum, I'm sure Jordan being a malcontent would be able to collect while being a pain in the ass.