I don't. If the hosted service (Tent.is) and reference implementation (tentd) only saved the latest version of a followee's profile, and the spec made it clear this was supposed to happen, we'd have a sensible default that would be respected in most cases. Also, your old profile being available directly from you is much worse than it being available from a follower: it's much easier to find and it proves the content is authentic.

Imagine if you publish a book and you've already sold 10,000 copies, when you realize there's something embarrassing in the book. You're not getting those 10K copies back, but you can at least stop printing more.