Oh man...
I've had several ideas about what should be the next successor to imageboards.
If anything, the constant board drama of 8chan has taught us that keeping the old system of letters as board names goes terribly with the idea of user-created boards, as for historical and practical reasons, some names are considered more prestigious than others. It's not a failure of the idea of board creation, it's just that the two don't go together well.
While I understand that people want to stick to the old system; isn't perhaps time to move on and try to make something new, something better? If we really want to give users the power to moderate on their own, isn't the logical system P2P, where posts are distributed between users who decide whether they want to pass them on or not? And why do we even have to use separate boards; on 4chan, there were those general threads that pretty much behaved as boards on their own, being more or less closed circlejerks, but if one allowed threads to branch, wouldn't that turn a general thread in a board of its own once it grows enough? And why do we need the top bar; the top25 system was removed, there is still the board list, but users themselves could put together catalogues like >>>/dir/, where they point others to quality boards (or branches, if you adopt the "branching general" system)?
It would be a pretty big feat, to think about all the things that could go wrong and try to prevent that in the design, and users would have to learn a couple of things anew, yes. But, as a result, we could create something new and better than the old system! The imageboard, the forum, and the social news system (reddit) have been used for quite a while, with mixed results, but now that they've been thoroughly tested, we can learn from their mistakes.
Just like how 8chan tested the user created boards idea. And it didn't turn out as well as we hoped.