True, but this is "only" a client problem. What is first and foremost important is the support server-side.
This ugly situation is just like if everyone suddenly decided en-masse to stop using their XMPP client of choice.
This is partly "waking up to reality" for the XMPP community, partly a huge tragedy for the lack of diversity in how people (used to) communicate over XMPP
...but none of these thing would impede Jaconda's users to receive notifications on their desktop or their mobile.
(If anything, I'd consider developers (Jaconda's users) more likely to have an actual XMPP client, rather than strictly relying only on what Google provides by default)
