I can't answer that, but my above point is the premise of the linked article.
Nintendo is reaching disney-level reliance on their cartoon hero, (probably worse) so I wouldn't be surprised to see them becoming another copyright-extending villain over the coming decades as they struggle to survive with their seeming lack of creativity.
Sure, Apple has trademarked Apple. MS has trademarked Windows. Why not Mario? It would have to be limited in use to video games, electronic entertainment, or whatever the narrowest category for such things there is.
Nintendo is reaching disney-level reliance on their cartoon hero, (probably worse) so I wouldn't be surprised to see them becoming another copyright-extending villain over the coming decades as they struggle to survive with their seeming lack of creativity.