For me, the future of managers is young expansive attacking managers.
Obviously at 49, he's not necessarily young, but his approach at RB Salzburg turned heads, he then moved onto Young Boys, in a league monopolised by Basel for the last 20 years, and he made them champions for the first time in 30 years.
He went to Frankfurt, and he signed young, attacking flair-like players, and he's basically making Eintracht a force again. Beat Bayern and won the cup, their first trophy for 30 years and he's developed some really quite good attacking players. Haller, Jovic etc... that's what we need. A manager who isn't afraid to go at big teams, is attacking orientated and Eintracht play some really nice stuff.
The likes of him, Nagelsmann at Leipzig etc are the people we should be going for.