If they're serious about going with the Disney Resort theme, I can see it. But it's a major expense for that sort of extension. There's a reason, even in the early Disney World expansion years of Eisner and Wells that the monorail hasn't been extended to include the Studios or Animal Kingdom parks.
Personally, I'd rather see them develop DCA to stand on its own first and then get the monorail over there. If they do a major redevelopment, include that in the redevelopment.