Nintendo, and the Super Mario IP in particular, is one of the biggest pop culture franchises that until now didn't have a theme park presence. It is a dominant name in video games and is revered globally even after 35 years. I personally thinking adding more attractions aimed at families will help further round out the Universal parks as a whole too.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.forbes.com/sites/lisettevoytko/2020/01/23/super-nintendo-world-will-bring-video-games-to-life-at-universal-orlando/amp/&ved=2ahUKEwj2rPD_7K3uAhXgAp0JHeOaBjwQFjADegQIFBAB&usg=AOvVaw3M_Pfn8QfxM_3--Jk5okfV&cf=1“Nintendo, based on our research, is the biggest potential driver in attendance you can have in terms of intellectual properties,” said Comcast executives during the call. “It’s up there with Harry Potter, and in some of our parks, HP drives incremental attendance of 2 million people.”