There's no way that the trade gets past the assistant coaches, that is true. But that's only because the coaches would have free reign to accept the trade before Dallas finishes proposing it.
Manu lovers are making us objective Spurs fans look really bad right now. Us Spurs fans are far from Mavs lovers, let alone fans. But any objective fan of any NBA team can see that Dirk would make the Spurs nearly ubeatable. In fact, if you threw out the "prime stipulation" and put Dirk and Tim together, TODAY, they formed the best frontline in the league hands down.
Put the prime stipulation back in and you have the greatest PF to ever play the game paired with one of the best shooters the league has ever seen, who also happens to be 7 ft tall and can shoot over anyone and score from anywhere on the court.
As for people claiming the Spurs couldn't run pick and roll, the wouldn't need to. All they would have to do is put Dirk at the top of the key, use him as a screener for Parker, from which Parker can dish off or take advantage of the mismatch. You'd have Dirk being guarded by a guy almost a foot shorter than him and Parker guarded by a guy who couldn't keep Parker in front of him even if Parker tells him where he's going on the court and when.
Throw in that the help would have to come off a 3 point shooter or Tim in the block and the Spurs offense would be nearly unguardable.