I was going to tell Karl "it already does say this"
but the relevant text is in the future directions
section for data formats, not for identifiers.
In fact, I think I made the same comment in my
review of the 28 Sep draft... ah... no, that was...
❑ 3.8 Future... 
                      * ❑ There remain open questions regarding Web
                        interactions.
                              * ❑ suggests once we answer the open
                                questions, we'll be done. Not so; the
                                web will continue to evolve as long as
                                it's usefully in operation. suggest: 
                                      * ❑ Web interactions are evolving
                                        beyond HTTP 1.1 and the other
                                        traditional Internet protocols
                                        (FTP, SMTP).
My comment on 2.7 was...
❑ 2.7 URI future directions 
                      * ❑ 2.7.2. Assertion that two URIs identify the
                        same resource 
                              * ❑ move under 2.2.3. Indirect
                                Identification 
                        
That might be too big of a change to make without chatting
with the group, so it might not be worth the bother.
Feel free to disregard this input altogether... it would
be silly to have outstanding dissent from Karl in our
request for Proposed Rec over something like this, but
there does come a point where it's time to stop fidgeting
around with the document.
-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E