I would hate it if Len, TJ or Archie would be traded. Mayby if it's for some really big name like Cousins but it would be tough loss anyway.
Candidates for trade are Bledsoe/Knight and Morris twins. I'm not desperated to get rid of them and wouldn't trade them without good return. But if they can get top3 pick I would do this without thinking. Mayby even for a bit lower pick if there is potencial star available.
Bledsoe is very good player but if he's your best player then it's not good. Only strong team that don't have a star are Hawks but they have experienced players with hight iq and a great coach. Suns can't copy that.
West is so stacked that there's no chances Suns will make the playoffs next year. Could they copy Houston and get player of Harden level by trade? It's doubtfull, rarely stars or potential stars are available for trade. And there is a risk that it would be so costly that Suns would be left with single star and nothing but bad contracts.
All great teams always started with drafting a star (then they could add another stars by trades of free agency but it always started with that drafted player). Mayby there isn't any star player in this year draft but if there is Suns should do everything to get him. I wouldn't mind tanking if this means lots of minutes for Archie and TJ. Wright could hopefully provide veteran leadership.
And personally I just prefer teams builded by draft than builded by trades. I dream of HOF player drafted by Suns that would stay with the team whole career like Dirk with Mavs or Duncan with Spurs. Is this too much?
