I think 3000 years or so would tend to dilute the blood connection enough that it would not matter. Chances are that no matter what part of the world you are from you will marry someone who is also in some FAR distant way related to you. It is unaviodable when you look at the number of people that can come from just two people over 3000 years, much less larger families, etc.
"Pacifism is a privilege of the protected"