I don't think a one size fits all approach is ever going to work, mainly because different games have different development and marketing costs.
I doubt a single price point of say £39.99/$49.99 works for all newly released titles, I think it'll be a matter of games that would have been solely handheld releases will cost what they would have if they'd only been handheld games and games that would have been only console releases will cost what those games would have cost if they'd only been on a console.
The library of content available to everyone is just greater and you can choose to play on whatever platform you'd like.
Maybe Nintendo can also do a service like PS Plus or Games With Gold, to give NX owners some games for a subscription fee and add an extra revenue stream for the platform. Perhaps if Nintendo took the approach of not locking online multiplayer for retail games behind a paywall and they move both hardware and 3rd party games then it will help to set a precedent for Sony and MS to remove subscription requirements for those services.
Even now Sony are releasing new games, like Ratchet & Clank or Tearaway Unfolded, which are full, new AAA retail releases, but those release for less than other big AAA titles.
I think Nintendo should do the same thing.
Making sure the really big indies also get physical releases would be good too IMO, whether they were meant to be handheld or home console, I think customers need to be given options to fit their own budgets and preferences.
I don't think NX games will be labeled as handheld or console release, more like just NX game or labeled by whatever the ecosystem's or family name is for Nintendo NX.
