DC tried to do that once with Mon El or Valor as he was called back then serving as their inspiration and I don't see many Legion fans or many DC fans being very positive on that part of Legion history so moving them away from Superman's influence might not help either.
A number DC fans act as if New52 ruined Teen Titans (for a while at least) but that was nothing compared to the effect COIE had on the Legion whose title was once one of DC's big sellers even in the years DC saw a decline before the Crisis changed every thing and now many comic readers see them as irrelevant because of the timeline shake ups the title had since.