Switch isn't the end point of Nintendo's transition as a company - it's the vehicle which enables that transition to happen. Nintendo still need to get the other pillars of their business in place and Switch's success obscures that fact. It's one reason why Switch will be Nintendo's major hardware system until 2024 at least - Nintendo need more time to get their other areas (subscriptions, mobile, merchandise, films, theme parks) up and running.
Nintendo used to have the two major pillars, and now Switch is overwhelmingly responsible for Nintendo's success. It also leaves Nintendo overwhelmingly reliant on a single hardware ecosystem in order to sustain their success. The plan they laid out in 2015 clearly accounted for the potential weakness inherent in such a singular focus and the transition into the new model is far from complete.