Well, yes but. The wording suggests that in the longago people did see light, but have lost the talent. There are only so many talents in a generation. I don't think it's that we've lost the skill. Rather, it's that a billion people now have access to cameras in their pockets that in Eisenstaedt's day required a month's pay and years of training to work. So now there is an explosion of "photographers" because the technology has put professional-quality cameras in the hands of everyone with an iPhone.
I think it is arrogant to think that we are the keepers of a hidden skill that has been lost over time. (And it was arrogant when Eisenstaedt said it, whenever he said it.) Ultimately, photography is about seeing, and about communicating the seen experience to others. It is self-evident that many never stop to see. But it was always so.