I'm not against bringing the kids up, not at all. I would be against them half-assing it and giving sporadic playtime. If they aren't serious about letting them develop this year and potentially punting the season if they all struggle initially then I'd rather they get everyday reps in the minors. If they are serious about playing them, then trade the people you think they'll replace and live with whatever happens in the standings during the ML adjustment they will likely face.