Hard to say, obviously a lot depends on contracts etc.
Primarily - and off the top of my head - I'd like to think we could keep Clarke-Harris, Turner, Brown, Dayton, Mellor, Winchester along with the tyros from the youth team and use them as the core of a young, settled(ish) squad that could compete at League 2 level. I've chosen them as I think they're realistic bets to stay either due to their contract status or potential lack of interest from other clubs (this is Dayton, though I think he's a long shot as he seems to be highly rated). Lockwood is probably a good shout to stay as well, I think he'd be useful as an old head in a young League 2 side.