bbPress does urgently needs a mobile friendly UI. I really hope the project can stand up again. To be honest I have more hope for some newcomers like Flarum. It feels like bbPress is abandoned. I am not sure if it is worth the effort (I see a lot of tickets lately) or if it would be better to integrate something like Flarum as it is also open source and was designed with the new web possibilities in mind. I hope the best for bbPress as I really like the BuddyPress integration :-)