I agree with nintendo needing new IPs and reinvigoration. Looking not just at Disney, but SE which got some great IPs when they got Eidos as well as managed to improve their development processes and reduce costs. However, current major nintendo IPs do sell pretty well so really nintendo dont need to do this. Even on the Wii U, nintendo's major ips have done pretty well. While nintendo are not necessarily winning new gamers (particularly in the mid-teen and above grouping), they still have a legion of fans.
You have to wonder though - what developer could they possibly buy to improve their fanbase? The most obvious dev in 2013 would have been buying out THQ (and all their myriad IPs) when they went under. The SR series are great and will do a lot to improve Nintendo's image in the adult gamers mind (of course they will need to tread carefully to avoid damaging their kid-friendly image) and Im sure with more thought and effort they could have made IPs like Darksiders and the Darkness etc profitable and successful.
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