DLSS technique is what everyone will use over time. Intel got its own version as well when they launch their series. AMDs actually supports it as well but in their CDNA uarch. The problem is the discounted RDNA uarch that is the lowest denominator.We'll see, in time, how FSR develops - as yet it is an unknown (in terms of personal experience using it).
As previously mentioned, implementing DLSS would cater to only a subset of players on PC and be of no benefit to console owners - so it doesn't seem to be a very likely candidate for COBRA development effort.
Look at Steam numbers. If you got for just Vulcan GPUs that spans the widest. You have about 35% being RTX capable. A number that fast grows. Elite doesnt need more legacy functions added. In 1-2 years you likely see 60% being RTX capable and 70% being DLSS type capable.