He won a World Series title (yay, he does get credit here, this came out of the Greinke deal, serious prospect development, some good trades, and an inventive bullpen use) but that was after a super long rebuild process even for KC (hired in 2006, made the playoffs in 2014), and after breaking that team apart post 2015, he spent the next 7 seasons with the Royals rebuilding and they have a bottom of the league system to show for it despite finishing at the bottom constantly and getting benefits like revenue sharing and extra draft picks.
He has also inappropriately allowed his religion to influence things in baseball, including holding an "anti-porn" seminar for his baseball team and very likely allowing it to influence his drafting and player selection, having a much higher fraction of his drafted and signed players seemingly be open and public Christians than could happen by chance alone. This may well have contributed to the extra long and failed rebuilds that cost him his job.
Adding in Getz to that, who would be coming from the White Sox's system, with a Royals background, and could be the only guy on Earth who might tolerate things being done with the same lack of professionalism and other problems that existed under Hahn and Williams, it does not look positive or hopeful on paper.