Quantum Physics, Vallée and the Future Human hypothesis
If alien visitors are future humans, then we must now exist at the intersection of multiple simultaneous future timelines that have yet to happen. Perhaps we are Schrödinger's cat trapped on the outside of an Earth shaped box. At this point in time, we live in a reality where "aliens" seem to both exist and don't exist. The phenomenon is always just beyond our grasp. We can't capture a high-fidelity image of a UFO or it's occupants because they are operating in this superposition of yet unobserved Heisenberg uncertainty. And, this is why abductions seem to occur in a fuzzy, psychic, here-but-not-here reality.
If future humans (Greys) are coming to warn us of nuclear destruction then we must be committing ourselves to this self-destruction. This is why they materialized *immediately* after we invented the atomic bomb. These aren't extraterrestrial aliens that flew in from another star system; we manifested these future humans at the moment of nuclear detonation.
If we continue to follow along this timeline, the abduction of humans will become more corporeal and undeniable, since it's said they are manipulating our DNA to better deal with this eventual catastrophe. Alternatively, if we choose to follow a path of disarmament and peace, then maybe the Greys will fade from our cultural consciousness.
Likewise, maybe "Nordics" are future humans on an alternative timeline where we've bred to a homogenous whitewashed form.
As culture shifts and humanity's intentions change, perhaps the reflections of the real futures that somehow ripple back onto us also shift. Thus, mythologies come from both the past and the future. This is the control system that Vallée speaks of. Except it doesn't come from beyond; it's coming from within.