But the main thing is mobile access via phones and tablets - before we were all sitting at keyboards, one way or another, and it took a certain type of person to do that in the first place.

Holy guacamole, you are SO right! The mobile accessibility is a true and ongoing obstacle for DW to be embraced by the Tumblr ppl. Because, yeah, like you mention elsewhere in your comment, there's no way of pretending to go back to pre-mobile devices era. :(