I don't see why everyone hates Baby Wario. I like him.
It's be cool that if all the other Yoshis were captured, and Yoshi (Green) had to save them. The babies would be Baby Mario, Luigi, Peach, DK, Wario, and my as well add Daisy. Maybe Baby Bowser, but not sure how the story would work. Maybe if Kamek is captured too, and they make a new villain