I'm webdeveloper by trade and my stack of choice is Django on the backend and React.js in the frontend. Misago is my passion project, and I'm obsessively passionate about it, developing it continously for eight years now, (although Github disagrees with me here ;))
Number of developers working actively on the project may be an issue (its just me with occasional contributions by others from time to time), but I'll say its pretty standard for OS projects without corporate backing, full-time devs or good promotion, and I think my contributions graph is proof enough that Misago's development over the years was regular and well sustained: github.com/rafalp/Misago/graphs/contributors
As for this being passion project, I want to make it clear that I am dead serious about it. Some people are cooking cakes, others are photographing nature, and I am constantly working on Misago making it better and better, adding new things, fixing bugs, helping people out answering questions here and polishing out the rough edges based on feedback I'm receiving.
As for 2022, thats 4 years from now. I don't have roadmap for that far out, but I'm sure there will be things then to make better in Misago ;)