Please don't mix up addressing and routing. "PI addressing" as you mention is addressing. SHIM6 will become a routing trick.
I think that is overly pessimistic. I would say that SHIM6 _MAY_ become a routing trick, but, so far, SHIM6 is a still-born piece of overly complicated vaporware of minimal operational value, if any. Personally, I think a better solution is to stop overloading IDR meaning onto IP addresses and use ASNs for IDR and prefixes for intradomain routing only.
Greets, Jeroen
(who simply would like a policy where endsites that want it could request a /48 or /40 depending on requirements from a dedicated block which one day might be used for identity purposes and not pop up in the bgp tables or whatever we have then anymore....)
I would, for one. Policy proposal 2005-1 (I am the author) comes reasonably close to that. It will be discussed at the ARIN policy meeting in Montreal in April. Owen -- If it wasn't crypto-signed, it probably didn't come from me.