Or, if they wanted to stick to the whole "girlboss" shtick, have both Luigi AND Peach be kidnapped, and have Mario, Toad and Daisy go on an adventure instead. Both Mario and Daisy would have something to prove - Mario turning from "regular" Mario to "super" Mario, Daisy from being the second-fiddle "literally who?" princess to someone who actually is proven to have the qualities to rule. And Luigi can hatch up a scheme with Peach to get out of Bowser's prison for both of them to get a change to shine as well. But what do I know? I'm not Miyamoto or Meledandri.