Too small. Ali, Foreman, SRL, Hearns, RJJ, Monzon, Tyson, Hopkins, Calzaghe, ODLH, Lewis The big superstars have never really been small. People just don't get the "wow" effect from someone who isn't bigger than their 8-year old son/brother.
Everyone you mentioned were Americans (besides lewis)...No american fighter at a lighter weight (besides mayweather) has been superstar like in talent.
Juanma Gamboa maybe, if he tightens up a few things Haye will be massively entertaining, but there's a fair chance he'll be an entertaining failure rather than a superstar.
dawson, gamboa and lopez look likely candidates, if haye does anything at heavy he will be a massive star