I would like to see that fill in the vacuum left by the Mario & Luigi series.
Seriously, I sorta get what Nintendo said about how that there are two turn-based, traditional JRPGs that feel a bit redundant; people without turn-based JRPGs as their cup of tea would be appealed by neither of them. It would be much more interesting if we saw another take of a Mario RPG that doesn't fall under the traditional, turn-based type, and a western-styled RPG for a Mario game would be one of them. Have a Mario looter game. Or an action RPG. Mario + Rabbids felt fresh and new. We can have a new take on the Mario series.