Brian,
Focussing:
In particular, the benefits would be the capability of establishing
new communications through the alternative paths.
Well, that is an intrinsic property of IPv6 surely - if a host has
two addresses, and one fails, you can try the other.
Yes, but the TCP session running will be torn down. This implies the
need for a shim layer, but I'm guessing Marcelo was suggesting that
there may still mechanisms help with this case. Am I correct in
assuming that you think this is out of scope?