MAVS NEWS:

[Winter]

At the very least, I think it's very safe to assume that it either halted or harmed the upward trajectory of the team's value.  Though, it wouldn't surprise if there were an actual dip due to all the fan unease that lingers to this day.  Lucking into Flagg helps a bit, but we are pretty far away from contention and Flagg's game is a bit less sexy than Lukas.

Flagg's game is a bit less sexy, but the fan base has NEVER had a true number one pick, and one strangely hyped as the best player a year in advance of him being drafted. Even Luka wasn't fan-worshipped until the end of his 1st year. So Flagg is a big deal for the franchise. Bigger than Luka in some ways because of the badly needed rebound effect after the trade. 

However, I would not disagree with you about team value. I'm not sure how they weigh such things, but I think we have to account for the fact we lost a strong European fan base when Luka was traded. We didn't pick that back up with Flagg. That's a pretty straightforward loss.