From what I've read/know the new coach is legit but ofc he is also an untested rookie.
Not sure what this means in terms of the future of the team.
The Nets are in a messy situation:
-It is very unlikely that they will be able to land high quality FAs : they have a mediocre front office and ownership and an overall bad reputation in the League + if an FA really wants to play in NYC the natural move is to go to the Knicks where you have Melo, Porzingis and Phil Jackson.
-They have a core of good players but they are ageing + they are not enough to compete for a playoff seed in the loaded East. If anything, some of the teams that stayed out of the playoffs last season will be better next season (I expect this to be the case for MIL and maybe Philly and Washington too).
-And ofc they do not have the key asset to rebuilding, aka draft picks
My reading of the hiring of the new coach is that they might have accepted that their fate is most likely to be out of playoff contention for the next couple of seasons and enter rebuild mode anyway; hence give an opportunity to an untested yet promising coach. (And in any case I do not think that Thibs or Brooks would accept working for the Nets in their current mess.)
It will be interesting anyway to see what the Nets next moves will be.