I don't know whether I'm just now noticing it, or if it's a meme or a talking point, but...
...Darn! I sure am hearing versions of the bolded part all the time recently.
In a discussion with an intelligent friend on Evolution, he reminded me that "No one really knows". He said the same thing about the age of the earth.
It was reflected in the Ken Ham/Bill Nye debate, with Ham taking the position, "If you weren't there, then you can't know."
I hear it constantly when discussing the probability of "life after death".
And don't get me started on Climate Change. And focusing on the phrase "the science is settled" rather than the science itself.
Another common, and apparently related theme is "Scientists don't know everything!" Trivially true, and stipulated, so why bring it up constantly?
Is it just me, or has there been a resurgence in what I consider a nascent "know nothing" world view? I see it as a first step in a slide from rationalism back into the dark ages, but maybe "It's Just Me!" (tm)