The point is not who exactly will replace Ralph, it is more that the club is always ready with an ideal successor. Semmens actually said in the interview they won't be able to get the guy who they had lined up anymore, so we won't be able to guess our next manager from his comments.
One question missing from the interview imo is how do we compete with clubs like Brighton, Brentford, and maybe Wolves, who all seem well run and I would imagine make the same pitch as us while signing players. Going back to Koeman era you could say we were the only Premier League club happy to sell but I don't think that's true anymore.