None can seem to think about a unified studio, with unified ecosystem and shared architecture and possibly a shared library. Nintendo doesn't need multiple teams working on two versions of the same game. It's inefficient and holds up projects and releases. Look at Smash 4. They are simplifying the process to maximize output. How hard is that to think about?
Unlike previous years where Nintendo may have said something like this, they've actually gone the extra mile restructuring their company for this. They're streamlining their development process, moved their handheld, home console, R&D into one big studio EPD, built more buildings, expanded.
Wii U and 3DS are two very different systems and it has taken at least 2 teams to make the same game twice. There will be no more of that going forward. They make games of various sizes and not just big blockbuster types like Zelda and Xenoblade, so it's really not at all hard to think of them having a higher output.
This was all stated by Iwata, planned by him, all to remove any inefficiencies, making their systems siblings again, citing Apple about same architectures and ease of development across hardware.