Some excellent point made here by all, & especially by Bob;
MS will miss the boat if they don't listen, there are already several very intriguing upstarts. All of them are a long way from the full feature-set/utility of 1N, but most are designed in such a way, that they'll catch up sooner than MS assumes.
Whatsmore...
Their ear is more attuned to their different users & their use-cases, they've moved to cover some compelling niches/use-cases, & they don't pigeon-hole themselves into only supporting their products, so they can force even more $ or compliance from the user.
5ys+ from now, after shifting the deck chairs x times, OneNote could well be the crusty/undynamic option that's on its way out, compared to the other options around.