A month ago I had a half-formed response to that, and decided to let it to coagulate before responding.
Except it didn't.
My thoughts were in the region of...
* Kinda cool as a protest against DNS, so long as a provider can guarantee a static address.
* There's still enough offline/verbal interaction for it to be impractical for many.
* I might have had a third point, but if so I forgot it. :(