You might even argue that Man Utd have never been a well run club, after Matt Busby left they even went down to the old Div2 in the early 70's
after which they never really competed for titles until the 90's. In those days much smaller clubs (Leeds, Villa, Derby, Notts Forest) all went on to win the league
and on occasion even the European cup.
So in that respect the last 10 years look like normal service has been resumed.... Perhaps Fergie was a genius.
With respect to Klopp, I remember when Shankly left (was also a shock at that time) commentators said it would be the beginning of the end and we
all know what Bob Paisley went on to achieve. Stable management and good ownership is as important as to what is on the field. (See Chelsea)