Only positive for Mills is outside of Randle, he didn't give anyone multiple years last summer, so if for some stupid reason a smart NBA person wanted the job, they are coming with a pretty blank balance sheet.
Yup, you have a roster with a few young players on the team, essentially a blank slate when it comes to salaries, and some extra firsts from Dallas. Even if they are in the 20s, those can have some added value when attempting to make deals, or even to find a guy that could be a rotation player moving forward.
If Ujiri is the target and they can pull him onboard, he's someone that has done well with later picks in drafts, especially since Toronto has been either in the playoffs or made runs and had lesser picks due to that.
But, Mills being gone is a HUGE deal. Since he was on board, the team doesn't make the playoffs or contend. The team only got better when he was gone. Left in 2009, and immediately were better. Came back after the 2013 playoffs and it's been downhill since. Amazing it has taken this long to move on from this guy, but we all know Dolan takes forever to make these moves.