One thing I'd take issue with though is the consensus around Pochettino as the best replacement should Mourinho end up leaving, more specifically the emphasis on Pochettino's Premier League experience as an important part of his credentials.
If we look at the sides who have been most competitive in the league in the last 15 years (us, Arsenal, Chelsea, City (Abu Dhabi period only) and Liverpool), the managerial appointments (not including short-term caretakers) break down like this:
No previous experience of managing in England:
Mourinho (first spell at Chelsea), Benitez at Liverpool, Ancelotti, Guardiola, van Gaal, Conte, Villas-Boas (at Chelsea), Hiddink, Grant, Sarri, Mancini, Pellegrini, Emery, Klopp... also Ferguson and Wenger if you include managers already in post at the start of that period
Previous experience of managing in England:
Moyes, Hughes, Mourinho (second spell at Chelsea, and at United), Dalglish (second spell at Liverpool), Rodgers, Hodgson, Di Matteo, Benitez at Chelsea
Comparing the two lists it's not at all obvious to me what the evidence is that top clubs benefit from hiring managers with previous Premier League experience, and wonder if it isn't just a bit of a hoary old cliche. A bit of Premier League exceptionalism maybe.