I remember when Chrome first came. I thought Google was wasting their time because Firefox was clearly the best browser, and there was no reason to think it would ever stop being the best. And the browser market already seemed too crowed with IE, Safari, Firefox, and Opera all competing for market share.
Keep now is not what Keep will be in the future. Google search, Gmail, Google Maps, Chrome, Android, and many other Google products are almost indistinguishable from what they were during their first iteration. And of those I listed, Gmail and Google Maps are the only ones I would say were actually better from the competition from day 1.
Evernote should be sweating at least a little bit.