Alternately, Wilder is making room for 2-3 players in the 30 year old bracket. I strongly suspect he wants to do something equivalent to what McClaren did: buy 2-3 experienced pros who are on the wrong side of their peak but who still have a good couple of seasons in them and use them to get us into the Prem. Unlike Warnock who bought his old-boys as back-ups, I'm pretty sure Wilder wants a bunch of "oven-ready" senior pros to go straight into the first team.
I've seen nothing in Wilder that implies he's interested in developing youngsters for the sake of it but he has flagged that he wants more players like McGree: young players who have had some Championship experience.
I do wonder if he has been burnt by the loan deals we've done this season. We've had 5 pretty high-profile loans and they have all failed, some of them spectacularly.
Anyway, I forsee around 3 senior-pros aged 30+, 3 McGree types and a couple of loans (maybe one being a keeper), all of them with previous Championship experience or top-end league 1. Then a bunch of projects and back-ups that he's not really interested in.