Nintendo can't support two distinct platforms anymore.
Hell, really Sony or Microsoft can't either.
People need to just let that go, it's not happening. Not with HD development, even if "PS3/360/Wii U" tier is your "low end", that's still requires incredible amount of resources. Now that portables can have PS3/360 level of power, the days of cute little portables that played little small games that could be made by 10-20 people are over.
Nintendo also has to support smartphone platforms now too.