when they finally make virtua fighter 6, you'll have the usual main menu that's like story mode, arcade mode, versus, online, training, etc. but when you pick story mode, instead of launching into another menu, it just pulls out and reveals you've been playing on a home console inside a yakuza/like a dragon game, and that's the story mode.
basically, put vf5 quest mode in the dragon engine, and there could be other side stories and minigames the series is known for as well. rewards could be little virtua fighter trinkets to decorate your room with, and maybe character customization items.
no offense. it'd be a sick idea