OPINION:
Brown is nothing special. Specifically numerating his "great" coaching talents seems to elude his loyal fans. However, the Kings players ARE special and their skills have been frequently discussed herein.
The Kings are a winning team because of the players and their performance. The key is to maximize the performance, improve year-to-year, and put a system in place that recognizes the team's skills. Brown could do that. That is why he has another one year to prove his ability to produce a solid system with improved results.
Remember that Brown sat on the Warriors' bench and no team was willing to give him another position at head coach until the Kings were desperate to replace Walton.
Brown has had two years with this exceptional group of players. Both years resulted in nearly the same record. A third year of such a record would show no progress on what Brown has to offer. It is time for him to "put up".
The hype about Sacramento being a dead-end destination is overblown. Available players do want to win, but moreover, they want the cash. They will come. Monk will be a bellwether on this point.
As far as a head coaching prospect, it is a matter of system as well as teaching skills, personality, and leadership. Just like Keon Ellis, you don't know until you try.