Interesting comment Phi. Having not found any evidence doesn't imply with 100% certainty that it doesn't exist. Besides, can we assume that ESP resides in bone, fossil or anything else the survives or lasts longer in decomposition. I'm not a neuroscientist so I don't how that is seen, say, in a 100 year old mummy.
"Enormous advantage" that's a boatload of assumption. We have mutations and genetic variations that in no way helps us at all, some of which kills us. Who's to say that ESP would be an enormous advantage. Knowledge isn't inherently good or bad. Yeah, if a person were to use ESP to find a safe location or route out, sure, that'll be an enormous advantage. But in the wrong hand, could it not also cause harm?
It would be interesting to take your assumption and simulate that in computer model though. Of ESP being used to help us survive disasters or something and seeing if this could lead to overpopulation or other problems. But this would require assumption of initial parameters that may or may not be correct.
John, I think this concept has a lot of merit as with each time we look at an issue, it contributes to our knowledge and understanding of it. But when a hypothesis turns out unsatisfactory, it should be modified or discarded (or a new one formulated).
And then there's the bias issue. People may prefer or expect one outcome or another. Like in the case of an ESP believer desperately wanting to prove of its existence or his opponent strongly believing this is weirdo world and wants to discredit. They need to be careful to eliminate this bias in controlled experiments.