This is an excellent idea that I think a lot of people would enjoy. Who doesn't like to be able to express themselves through a profile? It would give users more of a reason to click in and engage with other users beyond their posts/comments!

I just featured a link to your post in my list of proposals to enhance the Steemit website :)
https://steemit.com/ui/@timcliff/let-s-make-steemit-better-comprehensive-list-of-suggested-ui-ux-improvements-to-make-to-the-steemit-com-website