Considering how long he manages Atletico Madrid, some of their systems should be designed around Simeone so replacing him would take time. I wonder if the fans want that though. By fans, I mean those who travel and buy tickets to watch them play, not social media darlings who speak about "we are in a crisis" whenever their favorite team loses. Most of the time they're farming for views with their terrible analysis of a match.

Aiming for trophies is a good thing, especially if it's a CL trophy. The question is whether replacing a coach will magically answer that or not (probably not).