Your post is very vague, CopyCat...
Of course, dozens of new features and methods of doing things will be developed by the community.
Just as it is today, only a handful of people will find each particular module/plugin useful.
For instance, I absolutely hate user avatars and think they're nearly as bad as signature images, but others find them absolutely wondeful. Are avatars needed in the UBB? I don't think so, but others do.
In other words, I can't answer your question because it answers itself.