I agree with mknight comment, that rally overall top10 drivers must coverage even if they are WRC3 drivers.
As a rally-fan, I would like to see a lot of WRC2, WRC3, WRC-X action, but then it's quite complicated to have schedule with nice flow. Often stages are in row and there is not enough time to show all WRC cars sometimes.
To have "manufacturer" championship for WRC2 and by current names WRC2+WRC3 common championship for drivers would be really nice.
Anyway, probably this discussion is a bit offtopic here and should be moved to WRC+ thread or something like that.