Personally, I don’t trust anchor links to continue working forever either. Well, and sometimes they don’t work, even when folks open the link fairly immediately (but do then work, when pasted into the URL bar a second time, which I’m guessing happens when the page takes a long time to load the actual content.)

So what I do, is that I always describe the info that I link, as if I was only linking to the whole webpage. That it does take you to the appropriate section of the webpage, is only for added convenience.