Hi all,
The GTK+ mailing lists have already closed and all discussion has moved to Discourse, and they have seen a significant increase in participation as a result.
At the Tracker BoF in GUADEC we discussed moving to Discourse and everyone present thought it was a good idea, so I'm going to look at how we can migrate Tracker.
Basically we need to create a 'Tracker' tag on the discourse instance, and close this list and cause it to respond to requests with a notice that discussion is now on discourse.
Let me know your thoughts!