Just a quick note in favor of an updated roadmap (some may object to that label, but I think it's fine). When you and your friends are planning your weekly movie outing, it's very helpful to have someone who knows the group, knows what films are playing, checks people's preferences, mails around proposals, updates with corrections, keeps a list of choices for future weeks, etc. (Certainly not the same as imposing an agenda, except when the coordinator gets pushy.)
Core veterans like those on this thread are well placed to compile (not decree) such a document - basically an informed view of what looks likely to get rough consensus, and in what order. Of course some will dispute the priorities etc, but it's my experience that if everyone virtuously refrains from this kind of coordination effort, often the weekend rolls by without a film.
Agreed that specific deadlines often create more problems than they solve, but even without dates, clarifying priorities (eg, segwit before HF) is still useful.
All this is aside from the fact that I have many criticisms of the "movies chosen" so far and the criteria used to choose them - another thread (basically, I support an interpretation of "consensus" that takes more note of non-dev constituents). The consensus-marshaling effort is still important, and appreciated.