I sincerely think that this is a possibility in the future. I’m also certain that dungeons, existing ones included, will evolve in the future, but I considered ANet adding more than three dungeon paths in eventually, and really hope they do.
I’d even like some paths to take more initiative, feel more unique than the rest. Make dungeon runs really interesting when you run one path and then the next.
I would also like to see more options added to dungeon vendors. Perhaps not only stocking full items, but also item skins, perhaps even effects, like the CoF NPC supplying a fire effect that can be added to an item. Maybe even special upgrade components distinct to each dungeon, more than the normal dungeon rune, I mean.