It certainly seems interesting, and I bet they come up with some clever ideas for it...
But personally, I'd have rathered they branch out in other ways.
Paper Mario: Link's Papercut, where Paper Mario meets Paper Link (whose Paper Master Sword is capable of cutting paper, once he gets it).
Mario & Luigi: Earthbound Bros, where Mario & Luigi find themselves (at the start) in Onett, and team up with Ness and Paula (who the Bros immediately notice is quite similar, in some ways, to Peach).
Or they could even go for a third party crossover for each of them.
Paper Mario: Pac-Land, complete with Paper Ghosts, Paper Ms Pac-Man, and even Paper Pellets.
Mario & Luigi: Sonic Chronicles. Finally, Mario & Sonic go on an adventure together, even if it's not a platformer.







