I don't see how that could be made interesting...you seemed to avoid speaking about the gameplay in your blog post. I see Mario games as being master-classes of level design, which is their main draw. Because you can't control a player in an open world (without it losing what makes it open), you can't have that tight level design. Because of that, what do you have to ride on? The gameplay of Mario games is fantastic, but would it work if you were given a giant open space to play around in? And how would the game be structured? Would it be completely alinear? Most open world games tend to rely on missions to progress the game, but how would missions work in the Mario universe?
I think having levels is the best way to go for Mario games, but I wouldn't be opposed to having some being bigger and more focused on exploration. i don't think Mario needs a full open world though, I honestly don't really see how that would make the game better. Seems like it would just water it down.







