No, it would remove from the 'special'-ness! They're really meant to be 'the happiest place on earth' , so to be honest there's too many of them as there is!
HOWEVER, if they were to have Disney *STYLE* parks in each continent, then maybe, ie a Disney Studios, in one place, the DisneySeas in Japan, an Animal Kingdom in another etc etc, and of course new parks but with Disney style themes, but NOT more clones of the Magic Kingdom itself.