I don't think Rick Carlisle has any interest in tanking, and if that's what Cuban decides to do, then Carlisle will pull a Doc Rivers. My gut feeling tells me the Mavericks are going to try. On paper they have a passable starting 5 but not all that special and they don't exactly have a great bench to help them out. The only teams in the west that I see doing worse than Dallas this year are Portland, Minnesota, Denver, and the Lakers, which is just perfect for that pick they owe us factoring in the weak teams in the east.
We already know the Western conference shoo-ins are Golden State, San Antonio, Clippers, Houston, Oklahoma City, and Memphis. The last two spots I think will go to New Orleans and Utah. Hence, that pick should be lottery. But then there's the mid tier west teams like Phoenix and Sacramento who I think are better overall teams than the Mavericks as it stands.
The Mavs are right where the Celtics want them. Too good to be "bad" but too bad to be "good".