What is the story - is Dynamics CRM going away?

I have Netsuite writing to ask if we have a plan as they state:

"by 2020 Microsoft is having all of their customers make the switch to MS 365, which will cost as much as a new implementation. "

I've found nothing about this, and while I understand MS will try to converge on premise Dynamics CRM with Dynamics 365, it hasn't been my sense that on premise Dynamics CRM is going away.  Please ... I need to understand what the real story is here.