Do Not Delete Your Tumblr
From what I’ve gathered, the “adult content” posts will be locked away by being set to “private” but will not be deleted. Tumblr is not planning to delete/deactivate any blogs on the 17th, just lock away the “adult content” posts. This means, your Tumblr should still be here and you should be able to use it to keep in contact with all of your followers.
My blog here will be changing to a text-only erotica format, which I have read will be allowed even after the 17th.
Best of luck to everyone. Keep your blog and you’ll still be able to let people know if/when you start posting someplace else.
Here’s hoping MLH is right. His blog is actually what inspired my own and sent me down this lovely rabbit hole!
A lot of my info comes from Tumblr’s help desk: https://tumblr.zendesk.com/hc/en-us/articles/231885248
:)