I'm not sure I'd be quite so pessimistic. This is very much the Pixar Braintrust model of incubating new projects, which in their case was powered by their senior creative core, and whereas some of you are imagining a bunch of detached executives unwilling to make big gambles, the situation looks rather different if you realize that some subset of Miyamoto, Takahashi, Koizumi, Tezuka, and so on are likely to remain involved as senior figures, while understanding the need to cultivate new talent. And figures like these are neither detached from the software nor risk-averse.
Let's wait and see. Splatoon was such a smash hit beyond all expectations that the process that brought it to fruition is certain to inform Nintendo's thinking going forward; it's not like they'll suddenly throw those lessons out.