I agree with Jaime (about the terrifying picture and the general merits of small groups contributing to the whole).
I also think the key to the success of the theme-based groups will be knowing exactly who from our membership we want to recruit to them (and recruiting them directly based on existing relationships) and framing the themes in the way most relevant to the current political environment.
Based on that… I think our strongest themes might be “Community responses to police brutality and militarization” (perhaps framed to include surveillance), “Fighting economic injustice and alternative economies”, “Migrant Freedom”, and I would add Reproductive Justice.