Yeah. I agree with you on nearly all fronts, except I know sex workers and the queer community on Tumblr will be impacted: but I think fandoms mainly migrated to it because LJ's image hosting was never quite ready for prime time, though it did improve over the years. But people kept asking for threaded comments, the ability to lock certain posts to certain user groups, etc, and honestly the owner/CEO's response that he didn't want to become another LJ was dumb and shortsighted because I really think that is what people wanted - a platform with the blogging features of LJ/DW, and the image hosting features of Tumblr. If DW can manage that, I think we will see fandoms start to come back. I hope so.