Do you have a source for that? Closing the API seems crazy, since if done right it should provide far more value at far less cost to the Evernote team than many other features. Will this mean that all the 'Share to Evernote' integrations from email clients and other apps will cease to function?

Open, developer-friendly APIs also have the ability to fragment core app usage. That could be a big motivator.

Looks like the Evernote API is still open, alive, free and public:

https://twitter.com/evernote_dev/status/650089211844890624 https://twitter.com/evernotehelps/status/650086523719671808

If they kill their API, this will probably be the end of Alternote...