Diego Simeone has been managing Athletico Madrid for nearly 700 or so games if I am not wrong, which is quite a lot and something we do not see that often anymore, because most teams just change their managers like they are changing a sock so we do not get to see this many teams with the same manager all that often.
I think Atalanta had the same thing as well and they have seen the results of that too. In the end, I believe that we are going to end up with something different eventually, because Diego Simeone can't keep on managing Athletico Madrid for another 10 seasons, eventually something will change. Plus he is the highest paid manager in the world, that will not be fine with the team eventually, they may one day say lets fire him, get someone cheaper and use that money to get better players.
I have been expecting Diego Simone to retire or leave Atletico Madrid, but the management seems well satisfied with his service and decides to leave him despite spending so many years in the club without Champions League trophy or Laliga. The team is not tough as they used to be, they qualified for another Champions League again but always failed along the line, to me, he is like Arsene Wenger of Arsenal that year but Wenger developed Arsenal with his economy knowledge and help the team to accumulate some money to get their stadium and made the name they have today; even though he also didn’t win the Champions League, he happens to be the only manager in the history of Premier League to win the League unbeaten.
For the betterment of Atletico Madrid, Semione should be replaced with young manager with good coaching skills.