Well here it is 3 days after my first post on this thread, and after being chided by a few other members, there is still no definitive word from Google about the future of GV/XMPP or a response from Obihai.
"No longer supporting" is not definitive, nor is it a date.
Same as with everyone else, my Obi continues to work with GV.
Also same as many others, I'll not be switching to another service until it dies.
I'm still hoping someone is able to find specific details from Google, or for that matter Obihai, as to when this will no longer work so that I and others can plan ahead.
I don't think I'm asking for much here - just the truth.
(OK, maybe that is asking for a lot considering the level of corporate deception in this country....)