Fun topic..
I've always been, and still am a strong believer that Wii U has a ceiling of SNES-like sales/success levels, but this is ONLY under the condition that Nintendo does all of the aforementioned things (yes, because some random dude on the internet in his late 20s obviously knows better than a multi-billion dollar gaming company lawl..) If they stick to the path they are on unfortunately I see a floor of slighly-better-than-Dreamcast levels. Luckilly Nintendo is far better off financially that a DC success level will not put them under. But anyway, these are the 10 things I believe Nintendo should do to reach that SNES-level ceiling:
1. Another price drop, and more bundles, including a bundle that does not come with the gamepad. They could probably sell this at $150, as much of the cost likely comes from the gamepad. I also believe the Wiimote has more appeal than the gamepad, so Nintendo needs to go back in this direction.
2. Create more software that focuses on the motion plus stuff with the wiimote rather than the gamepad (obviously this goes hand in hand with point 1)
3. Pokemon MMORPG..nuff said (if ANY game would go perfect with the gamepad, it's this one)
4. Go back to Zelda's roots, similar to what they did with Mario. Zelda has strayed too far from its more difficult, fast-paced arcade style roots, and its declining sales show this point. I believe Nintendo will revitalize this franchise and create a blockbuster if they go down this route with the next Zelda. Make it top down/2D style, but at the same time, you could still show off some pretty HD graphics. The best of both worlds!
5. A truly NEW new super mario brothers; that is to say, a game that stays true to the classic 2D style, BUT at the same time has brand new mechanics, powerups, characters, and most importantly, new WORLDS. Think Mario 3 to Mario 1 transition or Mario 3 to Mario World.
6. Online achievement system. I know it sounds ridiculous and insignificant but there is a large portion of gamers out there that are increasingly into the e-penis thing of showing off their gaming achievements. This could help to reignite some interest in some people playing Nintendo stuff, at least on a minor level.
7. Unified account system. Give people more incentive to invest in your software digitally
8. Work to grab more exclusive 2nd party stuff like Bayonetta, but perhaps with more software with mass appeal. Since third parties are a lost cause, go with the 2nd party to help fill the gaps of the inevitable droughts. Absolutely FLOOD the Wii U with endless waves of quality games so that eventually, self respecting gamers will have no CHOICE but to invest in a Wii U. Coupled with a price drop, the sales will be almost inevitable at that point.
9. Create a new phenomenon type of game that appeals to non-gamers/lapsed gamers. By this I mean, a game that follows in the spirit of Wii Sports/Fit, but one that is entirely new, and draws in the masses again. Wii Sports and Fit sequels simply won't cut it, as they are simply following a path already forged, rather than create a new one. Perhaps consider reviving the vitality sensor thing, and create a "relaxation" game. This could particularly be huge in the frantic paced society of America.
10. Create new CORE franchises. focus on the genres in which your lacking. Maybe a new RPG or action game from Nintendo? How about a brand new Mario RPG game from Nintendo and Square? How epic would that be??
Wii U will just NEVER reach Wii levels of success no matter what Nintendo does. The writing is on the wall there. BUT it has the potential to at least perform decent numbers if only Nintendo will wake up a little and reexamine the elements that made the NES and Wii such hits, and apply them to the Wii U.