I have to agree that Lupone doesnt seem right for this: there's an undercurrent of anger in almost everything she's done -- her turn as the Old Lady in the recent CANDIDE was frightening. Bang on for the character, but still frightening in the amount of barely repressed anger she conveyed.
Peters? No. If anything, it would be too much in the opposite direction, a little child-woman... which is not what Dolly is either. Reba would be interesting, but it'd be difficult to get past the accent, even for a star turn.
But if we want to get a little out there, it'd be fun to consider someone like Carol Burnett. She's overdue for a return to Broadway anyway, and face it: the tourist trade would *love* this.
http://docandraider.com