This is one of the best squads we've had in years including seasons in the premier league. He won't want to completely decimate it and bring in as many as 10. There is no need and it would be counter productive.
This squad with 4/5 high quality additions will do fine in the premier league. Think how bad we were the last time we came down, players like Ball, Arquin, Marwood etc, we are night and day from that now. A team that absolutely smashes the championship in the manner we have will be well capable in the premier league.