Dueling needs to stay, in one form or another, and while everyone should be able to it, 2-3 Clans should be better than anyone else. We alrealy lost Ancestors, Regions, and Celestials. The game should not lose so much of its flavor. Flavor and fluff is what made people care.
The game also needs to avoid a homogenized version where clans and abilities are vanilla and uninteresting so..
If you are Mantis, for example, sorry you are garbage at dueling and should continue to be garbage at dueling (even with your Ogre Bushi's on boats).
That should really go with every avenue of play (military, economics, political, etc.).
The game should keep it?
Or Mantis are garbage?
That every clan should have strengths in certain areas of play but weaknesses in others so that everyone isn't vanilla. However, the option to do X with Y clan should exist.