Wow lot of opinions. I personally believe Satoshi's identity has been carefully planned to remain unknown when he thougth his plans. But we gotta be real and say no one is anonymous online nowadays.
Using 20 VPNs in sequence along with Tor from a cybercafe won't change nothing. If someone really wants to find you and has enough ressources, he will.

So i guess Satoshi's anonymity is partly due to the fact that he was active way before he became known -- and potentially searched --
Also no one wants to engage so much ressources and money just to find him, but with an unlimited amount of money he could probably be found.