No, writing was invented multiple times by different peoples, as your own bit on Stonehenge demonstrates. This means things aren't as linear as you suppose. It's the same principle as with America being discovered long before Christopher Columbus (Vikings and talk of Egyptians even), or how about the ancient Greeks knowing that the world was round! I could go on.
It's understandable that you misinterpret my position; this whole argument was tangential from the start because I had to decipher your position with nothing but a cryptic one-liner nitpick about writing and 4000 BC like I'm freaking Sherlock Holmes. And you accuse me of wasting your time! Though admittedly, I had it coming by telling you to clap your trap flap.
My original point stands, and that is it's stupid to go back a million years before we figure out 1,000 BC to 10,000 BC and beyond.