I don't know if this already exists, but I think it would make perfect sense as many people have done the challenge before. This would include Super Mario Bros, Super Mario Bros The Lost Levels, Super Mario Bros 2, Super Mario Bros 3, Super Mario World, Super Mario Land, Super Mario Land 2, Super Mario 64, Super Mario Sunshine, Super Mario Galaxy, Super Mario Galaxy 2, Super Mario 3D Land, Super Mario 3D World, Super Mario Odyssey, New Super Mario Bros, New Super Mario Bros Wii, New Super Mario Bros 2, and New Super Mario Bros U. (If we actually debate this category existing, we can discuss New Super Luigi U being included as well.
https://www.speedrun.com/multimario#Super_Mario_Console_Series_Any This is the closest thing we would get. This is already a meme category with how much work would need to be put in. Kosmic (correct me if I'm wrong) is the only person to have done this. I doubt anyone would do another anytime soon.
I’m doing one over spring break, will most likely be TA though due to scheduling restrictions