It all depends on how easy is for 3rd paties to offer support and if Nintendo has big core games ready at launch. If they do, even if the headstart ps4 will have in catalog, nintendo games could make up for it, and by 2017 people will have the money saved since they would have the ps4 for year then.

 

I myself never owned a Nintendo console (other than the original gameboy), but if they get their act together in relation to good hardware, with Hard drive, good online, good digital store and core nintendo games, remaster and/or backwards compability. I would buy in a heartbeat, even if the hardware wasn't as good as ps4.