They aren't likely to do this as it would restrict the available design space for new classes/jobs. Every one of those options you mentioned could instead be given to an entirely new class, and if they gave them to existing classes instead, they'd have to start going into some pretty off-the-wall places in future expansions for weaponry. While they'll probably do that sometimes (the Star Globe for AST was fairly unique, and Dancers have often used ribbon-type weapons in other FF titles), I suspect most new jobs will be using relatively familiar weaponry.