2.5 - 3 WAR player (and could be better with a competent coaching staff). That's an improvement over at least two playoff teams center field options
Young also is one of those xStats underperformers. .037 on xBA, .054 on xSLG, and .036 on xwOBA. He's one of the guys I don't mind low launch angles because I don't think he has real power but you could say he may be closer to 2024's offense than what he showed last year. Even this year, his numbers against lefties weren't unplayable: 10.7 BB%, 18.4 K%, .317 OBP. I say he's a short side of a platoon CF / 4th OF / defensive replacement as kind of a floor. The old question of, "Jacob Young: Bona fide major leaguer?" I think has been answered "yes." I don't think that's valueless in trade. That said, I also don't think he'd be valued as an average to above average regular CF at this point, which is what a 2.5-3.0 WAR guy is.
"IF he's that good, why not keep him?" might be the question the Young backers would ask (hello, IdahoNat). My thought is that, on this team, MLB outfielder might be the closest thing to a surplus position that we have, he's certainly not the kind of RH bat the lineup needs, and we may have 2 legitimate alternative rosters and lineups that look pretty good without him. The obvious one is the Wood / Crews / Lile outfield, leaving DH open for rotation or another bat. Another realistic alternative would be to play Crews primarily in right and to rotate Wood, Lile, and others through DH. This could be done with a CF time split between Hassell and Franklin. So, I/M/O, Young is a very sensible guy to shop in a deal, and there's a ton of teams that would love his glove in CF if they think he could produce as at least a righty platoon guy.