I'm not totally sure I agree there. True20 works off a Damage Track, as does SWSE. The skills system in SWSE is related to that of Blue Rose, True20's predecessor. SWSE follows in the tradition of a fets/talents build system, and True20 uses three and no more than three broadly-defined "classes" customized solely by taking feats and "talents" converted to feats.
SWSE, because it's so combat heavy, did some amaaaaazing work on the combat side of the game.
I'd like to see that universal damage track in SWSE converted to True20, but the difference in damage may preclude that. The level-to-skill rank in SWSE could be a campaign "setting", that is, turning the dial from "true life" to "pulp/heroic" . Some way of changing True 20's fatigue roles for FX powers to the "by encounter" system in SWSE would be nice. Thos static "defenses" in SWSE are ridiculously elegant.
I think what you're looking for, instead of a stright blend, is a True20 all-genres feel using mostly SWSE mechanics. Without Hit Point. Lord, I hate hit points.
On a side note, I'd love to see the Spycraft half/action/fullaction system in True20, although I have to admit, swift/move/standard was explained so elegantly in SWSE I'm kind of down with it now.
I agree, too, that M&M with the last of the D&Disms stripped out would be a pretty sweet universal RPG.