CMRoyal I think we have to remember that SC only has a year to run on his contract. I'd be amazed if he stayed beyond that, so given the optimistic scenario of an immediate return to the top flight (call me a plasic-spastic little-Readinger if you like, but I'd just settle for winning more than we lose next season) I think any conjecture about Premier League lessons learnt is completely moot in regard to SC. The biggest task for Madeski and Hammond this season will be to line up SC's replacement, and whoever it is will require Premier League experience.
Did Southgate have PL experience? Did Keane have PL experience? Did Colman have PL experience? Avram Grant? David Moyes? Mark Hughes? Steve Bruce?
I'll just settle for a good manager.
If Coppell can then work alongside an assistant to bring them up to speed then all the better for continuity and it would be a sensible approach rather than the traditional clear out of staff.