Wow - a lot of (mis)information here.
So far I've read dozens of articles and forum posts declaring the death of XMPP and not one person has posted a link to anything official from Google.
If someone has a link directly to a Google page that indicates the proposed change(s) for May 15, I'd really like to see it.
Otherwise, this is all uninformed speculation, particularly since my Obi is connecting perfectly as of today.