The why behind IndieWeb [indieweb.org] is stated as: "Whatever the reason, you're done with sharecropping your content, your identity, and your self."
Given the vast numbers of people still using Tumblr/Facebook, it's not a place the vast majority of people are at. Which means any "solution" IndieWeb offers will be to a problem most people don't have or care about. Particularly when the proposed solutions have significantly more friction than continuing with the status quo.