I do believe that as more and more professionals come forward and talk about their NDEs that it will become harder to discount them. In a physicalist, universe these kinds of experiences would be impossible. However, I do understand that "Confirmation Bias" However, I do understand that "Confirmation Bias" can be an issue with any conversation that deals with seeking the truth, I suffer from it.
Jeffery Long has actually stated that the NDE proves the existence of God and the afterlife. Here is a site for his book, a good read. Not sure I agree with him, but I do believe that these experiences have always been with mankind, and that is the reason that belief in God, and the afterlife has developed.