Does it really matter one way or the other? Fathers will still be made to go spend money on a makeover for their pre-teen daughters. The only thing is that there would be no one to meet and greet. Kids know who Hannah Montana is and that she is Miley so meeting "Hannah" may not be that big of a draw. At least with the HSM stuff at DCA they don't pretend to have the actual stars or people supposed to be them. At least with the Princesses, you get to meet them.
Remember, Dreams come true!... and mermaids are hot, even on Halloween.