I am more attuned to your valuations (KWP?) but if we lose all of those players in the summer, we will be in freefall next season through the loss of any sort of continuity. For that reason it is unlikely the club will let more than two or three leave unless their contracts have expired. Sensibly they will only let leave the players that they want to let leave.
Dibling, Fernandes & Sulemana must be the backbone of rebuilding a side that can challenge for the title and fare respectably in the Premier League so if SR are serious about a PL future then they must fight tooth and nail to resist their transfers.
If you and others are right and the team has to be rebuilt from the ground up than finding a way back to the PL will be challenging. In a worst case projection it will be years before we can fight our way back. Juric for one is unlikley to hang around for long if our immediate prospects are poor.
Expect that Ipswich & Leicester will be the sides to beat next season so there is only one promotion place left for us and the three clubs from the top six in the Championship this season who miss out on promotion in May.