OP is right but is being too wishy-washy about it. The fact is that not only will no trade possibly improve this team, but no trade has improved any team ever.
Find one example, I dare you. You can't, because quote all the dork stats you want like winning percentage and championships, you can't get around the fact that if a trade improved a "team", they were obviously never a team to begin with. Checkmate, nerds. Better luck trying out for the Bing Bong Theory.