I agree, which is why Nintendo is trying to reach new fans through Amiibo, theme parks, mobile, etc.
In other words, I don't think their plan for growing the home console audience is to do anything different from their normal MO of being reluctant to cater to third parties and relying on doing unique first-party games instead.
I think that their strategy for growing the home console market is going to be almost totally separate from their home console strategy itself, excepting elements of connectivity between, say, playing a mobile Nintendo game and using that data on the NX somehow or tie-ins between a theme park attraction and a game based on that attraction, etc.
And I think that, for them, catering to the dedicated Nintendo fans is profitable and, as far as competing for other "hardcore" gamers out there, is enough for them. I expect them to try to expand their audience with non-traditional gamers ala the WiiU by chasing more blue ocean tech advances and doing mobile, theme park, etc., stuff outside of their typical home console strategy.