There are two possible reasons for two servers:
1) too many people for one -- if this is true, we will have to have 2 servers
2) different rules -- if this is the only reason, I'm not sure I'm for it.

But let's say they do have too many people for one server. I think it would make a lot of sense to move the kill-everything crowd to one server, and let the other server continue as normal. Normal being what we have now: open world PvP with safe zones around camps.