If they bring quality Drama that I have watched - i will most likely watch it again. i.e.Misty, Sky Castle, Signal. But I will not watch any old Drama that I have already seen. They pretty much upset me by bringing Cleaning Up to Asia, but not to us in the USA.
I do not think they pause a threat to Viki by bringing old KOCOWA materials. Viki does not keep their licenses for a long period of time (for the most part)
I think most of the time that Netflix brings material that is on VIKI - they buy it from Viki, as they have done before they started licensing it independently of Viki.
Viki still sells to other sources, such as Hulu, that clearly states it comes from Viki.