I own both 2ds (didnt care for 3d gimmick) and U... chose both for its library exclusives. As for the NX, if they share the same library, I'll get the home version no doubt, but HH will depend on its features and price point.
Game handhelds were evolving alongside mobile devices but now reverting back to pre gba days. Nintendo needs to incorporate more telecom into their next HH, unless they are comfortable with going back to being a cheaper leapfrog type toy. I won't say "Nintedoomed" but they're in danger when it comes to hosting games on its own HW. Nintendo is lost in the middle, its time to compete with the big dogs again, or go dramatically low end/a starter device for kids (niche game system). Nintendo, (unlike Sega back in the day) is in good position to be competitive, but sadly, have not displayed the desire to do so - instead, opting to fly under the radar in hopes one of Sony/MS eventually bows out of the business, before reentering the fray.
All signs point to Nintendo being at a converging point with NX, but unified library aside, its still important to offer enticing and unique experiences for different HW types. Home/HH need to be more desirable "must own" HW, than mandatory must-own. The fall from WiiDS was dramatic and they need to start pushing units closer to 100 mil per gen, for the sake of their business. Cross buy will make any iteration of NX a stable choice, but Nintendo's goal should still be to sell as many HW units as possible, at a profit, from day 1. Hopefully, we'll soon find out what the "NewXperience" is all about.
