Although I am now blissfully just a consumer, I would really like to see tighter integration between Discourse and Mailman3/HyperKitty. I am personally managing Discourse well enough, but I can feel the scalability cracks, and I fear just not being able to keep up if python-dev were moved completely to Discourse. In all honesty, I’ve stopped following python-ideas, although I do occasionally drop in via Gmane. Gmane/NNTP access to the list archives is obviously a pretty minority use case, but it works really well for me.
My ultimate dream would be to add an IMAP and/or NNTP interface directly to MM3/HK. Then I could use my normal mail application to catch up and interact with Mailman lists in a very lightweight way, driven entirely by my own workflow. That plus a Discourse bridge would be a pretty powerful and flexible combination.