There are probably many ways to swap around content, rewards and avenues really easily to make the end game more satisfying, and to make it much more obvious where the 'game' ends and the 'endgame' begins.
All the elements are there, it's just that they are in awkward places due to the fact that the game is still in development.
It's not that I wish to lose any vicious content, or even change the difficulty of those dungeons; just have them removed from the economy and system which drives the rest of the game.
Make it really obvious that Vicious is all about seeing how far you can push and twink a character, rather than being the next natural step. Kind of making them the optional, crazy bosses rather than the proper 'final boss', like the materia monsters in FF7 (if anyone remembers those