I don't think that this is anything new.Rooney canned by Birmingham after about 15 games, lol.
What is it with that former golden generation of great footballers all being terrible managers?
Neville lasted about 10 minutes at Valencia. Rooney took Birmingham from 5th to 20th in just a couple months. Gerrard’s flopping in Saudi after flopping at Villa and Lampard does no good wherever he goes.
What were their equivalents from the previous generation?
Terry Butcher, Trevor Francis, Glenn Hoddle and Ray Wilkins, perhaps?
A lot of the best modern managers weren't outstanding players.
Guardiola's probably the most obvious exception and Simeone might be the other.
England appears to have stopped producing top managers in the 70s, unfortunately.

