I agree that this incomplete/codominant issue is not such a big deal. The world is not going to end if people dont start saying incomplete dominant insted of codominant. Each person has the right to continue using the wrong terminology if he/she wants to. What i can't understand is WHY someone who knows he/she is using the wrong terminology would want to continue doing so. When i learn that i am doing a mistake i tend do correct it. To continue making the mistake just because other people also do it is not, in my opinion, a reasonable excuse.