I see two directions, technology-wise. Either we go to the old tech,
which is some combination of IRC and mailing lists. Or we go with the
newer tech, which is a group or some simulacrum of it, using either
Facebook or Google Plus.
Personally I'd advocate for a traditional mailing list, perhaps with a
simultaneous IRC group, both of which are logged/retained. Because no
other medium besides a mailing group admits such long posts and
analytic interaction as Usenet/Netnews does. At the same time, we're
already used to a level of interactivity, which is hard to come by
unless we utilize something like IRC on the side; the modern web-based
social media aren't conducive to rational discussion.
Google Groups hosted mailing lists might just provide a middle ground
solution. They're fast enough to support dialogue, they support email-
only interaction like Netnews, but then there's the archival issue: we
don't want our discussions to just go down the drain when the group
administrator suddenly decides to retire.
I know I'm speaking as somebody who hasn't spoken in a long while. But
I'm also speaking as somebody well-versed and highly interested in
preservation, and someone who's been using both the older and the
newer means of online discussion tech for a while now. From my
viewpoint the best thing which could happen would be if we had full-
function gateways between Usenet, IRC, a Google backed mailing list,
and perhaps even a G+ Circle. But since that has never happened before
to my knowledge, even on fora which were already divided between web
boards and mailing lists, and in a similar pinch otherwise...
I'd advocate going to a public mailing list, even if it's old tech.
Perhaps as an interim measure, but still. Preserving everybody''s
(Google's as well) archives of the group, merging them to a single
comprehensive archive, distributing that archive back to multiple
people (I'd be more than willing to carry one of the copies), then
migrating the discussion elsewhere, and finally after a period of time
gracefully shutting the Usenet group down altogether.