True, but how long can Nintendo stay afloat with only the strength of the Mario franchise to lean upon. 3rd party developers are giving the WiiU no love, and the WiiU doesn't have the hook to attract casual gamers the way the original Wii did.
I think parents will still choose Mario, but that number is going to get smaller and smaller as time goes on. Why spend $300 for a console that only has Mario games? That's not a good way forward for Nintendo.