Wanted by who? or is it pushed for?
You see this is why I think current skill system is not going to keep players playing.
You're making classes which will work in large tribe if people are willing to stand in one place forever just leveling two skills, another tribe will do the same and you end up having same problem which is "trade", because you and other tribes will have everything they need inside their own tribe, so the real problem is going to be for solo players not being able to live their own style.
Who do you think you had most trade from in the past? is it large tribes? or homesteads? That is your diference.