I for one love the idea of a duardin soup. I just maybe don't trust GW to do it justice currently. I like mismatched armies with people of different background and ideological standpoints working together for a common goal. To me personally it looks better on a table and in art than hordes of the same unit.
In an ideal world there would be three subfactions and a soup faction. FS, KO, Dispossessed and altogether. Dispossessed would get immediate new models to act as a bridge between the other two very different aesthetics. KO could be very clearly positioned in the lore to be working as allies to the other duardin and respect Grungni as a person while not praying to him.
My issue is if GW throw the current models together without new ones. I felt a little cheated by warclans because it didn't come with anything new. Or if they suddenly say that the KO blindly follow their new god.