TRADE: PJ Washington+ 2 2nds To DAL | G. Williams+ Curry+ 2027 FRP (top 2 protected)

[F Gump]

1
The farther into the future the draft pick is, the riskier is the move.  The MLE was probably a fair value contract for Grant Williams over the summer. 
2
Providing the option to swap picks with Wembanyama's team in 7 years was an idiot's move. 
3
We could have easily just rejected Reggie Bullock's team option and signed Grant Williams for the MLE without the pick swap. .

1 That's one way of thinking, but it's exactly backwards if you are trying to build around Luka. With Luka you want picks NOW to improve the team, not later, so the ones you have to offer are those later down the road. See Lively, Derek. Your approach is working under the assumption you will suck and Luka will leave, rather than working to improve. Other teams want to roll the dice on later picks, but if you want to improve now, that is how you play it too -- you offer those later picks they value so highly, use the soonest to improve the roster, and then let them squirm when you are even better later.
2 Not necessarily. Wemby will perhaps make them better. Then again, who knows (it's not like they are winning big so far). And if the Mavs are a good team later (Luka in his prime), the Mavs can have the better record, making the swap worthless. All swaps are like that - and this Mavs team is young, not old.
3  The Mavs can't decline Bullock's PLAYER option for him. They decided he was done (and the NBA seems to agree that he's washed) so wanted him replaced. And he wasn't going to decline it.