People with either a handheld or a home are the vast majority though.
If Nintendo can free some resources by avoiding to make both Mario Kart 7 and 8, but just one Mario Kart 9 that will run on both form factors it is very likely that they can put out another, different game, thus helping the variety (which in itself should be improved anyway with the alleged unified development... I mean, how can be argued that merging the home and handheld lineup would *not* end up in having a quite rich and varied offering?)
I agree with this, and your example with Mario Kart is the one I choose in previous thread too

However, even like that, it's hard to be 100% optimistic:
- (1) MK9 development still need 2-3 years, maybe even there will be a few extra weeks for both form factors (better than two full dev cycles, of course). Plus post-releases updates and DLC.
- Given the faith I have (and explained why in my previous post) in software planning, I don't know if they will not simply do MK10 after MK9!
- And in any case, because of (1), the required extra software output/variety, will not show before MK9 is actually released + another 2 years of development.
So I agree it's all good on the long term, but I don't expect miracles during NX first year.
Usually Nintendo don't care much about 3rd party, and try to drive themselves their platforms at first. I'm starting to think they are more than ever in that strategy right now.
It's not bad either on the long term. Thanks to unified platform and incremental upgrades, 2016 NX games will still naturally work in 2020 on NX 3G+, just like Flappy Bird works on Android Marshmallow.