Bawolff, I don't think the list of attendees of the current SF meeting
is indicative of anything other than of the difficulty we have in
talking with non-Wikimedia people; and even within Wikimedia, between
WMF and non-WMF. Cf.
https://www.mediawiki.org/wiki/Talk:MediaWiki_Developer_Summit_2015#Name .
As for «fairly regularly active devs for at least 5 years», we simply
have no idea how many such persons there are outside our fishbowl. If,
before even starting, we already exclude the iceberg of invisible people
and use cases, no wonder we stay where we are. You don't need a
committee to reinforce and calcify existing trends and structures.
If there is a need to expand/strengthen/diversify the committee, I'd
rather look for members able to enlarge the MediaWiki contributor base
in new directions. Mark mentioned some examples. Again, all this in the
assumption we suffer from disunity, see my previous message.
Nemo