TBH I think the target audience IS (basically) fifth graders.
I agree with this. It was as a child that I fell in love with Cosmos, Sagan, and the magic of reality itself. We all had those handful of movies that we watched over and over again as children (or still do). My friend's daughter watches Beauty and the Beast and Little Mermaid over and over. I watched stuff like Willow, Princess Bride, and TMNT. But we also had Cosmos on VHS recorded directly off the TV feed, commercials and all, and it too was one of my 'over and over again' types movies. I must have watched it 50 times and this was all before high school. I've reinforced my love of these subjects over the years but the original genesis of it all was Carl Sagan and Issac Asimov.
That said, Evolution is by a huge margin, my favorite subject on earth. When my friends get me going on evolution they have to eventually tell me to shut up or I'll never stop.
The scope, the breadth, the beauty, and above all the immense explanatory power of natural selection will, I hope, never cease to amaze me for the rest of my life. If I can ever find a way to share the gift of this understanding with anyone else, I will (and do) do it. I believe people like Carl, Tyson, Dawkins, etc etc all have a similar feeling inside them. (*edit: In fact I know they do. They're the ones that gave it to me in the first place!)
Because of both of these things; my childhood love of the show Cosmos and my lifetime love of evolution, this last episode was dear to my heart and I was almost afraid of watching it. My fear would be that we would get a History Channel version of evolution. A version produced by spineless people who have a deep seeded fear of the religious right and/or politicians from Oklahoma. But we did not get that at all. We got a very unafraid version of evolution and I couldn't be any happier about it.
I was very happy to see them tackle head on the argument of Irreducible Complexity and was pleasantly surprised that they chose the Eye as their target organ, it being the gold standard of irreducibly complex organs. And the way they did it with the split screen? Brilliant.
The other little subtlety that made me swoon was when he said that dogs domesticated humans. I was beaming from ear to ear when he said that. Of course, we domesticated each other symbiotically just as all organisms do but still, I was so happy to hear him say that.
I must say, all my anxiety and fear about this remake has been totally misplaced and I should congratulate every writer and producer involved in making this. They are doing a very good job.