Keep has been going at full steam for 3 years now. It's one of their prime apps to show off drawing capabilities of the new generation of convertible Chromebooks. Don't worry, Keep is there to stay.
No matter what you use though, you should have backups of anything important.
I just make spreadsheets at sheets.google.com, make it editable offline, edit on phone with Sheets app
tune in next time when I bore you with my org mode setup!
You mean it's a keeper? Sorry, it had to be said.
Yes - I'm very confident Keep will stay.
[1]:http://www.theverge.com/2016/8/19/12555052/google-shutting-d...