Why isn't X ethereal?

[NTJedi]

Vampires should probably get back their ethereal trait because they are quite vunerable now. In exchange for the ethereal trait vampires should receive one of the following punishments below:
1) cause population to drop since they have a strong desire to feed.
2) stats lowered for balance reasons... ethereal was removed because I assume they were viewed as too powerful previously.
3) each turn they lose 2hitpoints when leaving their original province the same as the blood lord and blood warriors... thus forcing them to be pushed into battle to steal more life.