More games. If they cannot get third parties on board and they have to go at it alone whether it's due to bad relations or because 3rd party games simply don't sell well, then they need to step it up. Try to make it more than a secondary system which you really only turn on when once every few months an exclusive comes around that interests you. This might include buying up or partnering with more developers, coming up with new ips(which to their credit they have been doing), and /or hiring more people to to step up production.
Now that they are profitable, they might also have room for a price cut to 250 this year and 200 next year which might make the difference between it selling 16 - 18 million lifetime and 22 - 25 million lifetime.
I have a pc and wii u for the record. I follow my heart when I buy Nintendo stuff and it's probably the only company that I still will pay a full 60 or pre order for games, but I game on a pc as a pure pragmatist because there are just too many games you would be missing if you don't have another system.
