They likely would have likely been one of the top 5 or 6 teams in the league along with GSW, SA, OKC, Houston, and Cleveland. Low-level contender, but contender nonetheless. Parsons-Dirk-Jordan is a great 3-4-5 trio. There's no way LA could have competed. The teams the Mavs have been putting on the floor these last couple years could run Kobe's squad out of the gym.
Like I said fighting with the Pelicans & Suns for the 7-8 seed IF they got Jordan. Would have still been behind the Warriors, Rockets, Spurs, Thunder, Clippers & Grizzlies. Jordan is a role player and with no CP3 feeding him would underperform. Teams without a stud PG/primary ball handler get shredded in the NBA and the Mavs have nothing in that regard.
Fortunately Jordan came to his senses that he was being conned.