2. Satoshi got depressed, because bitcoin not worth anything to him anymore... he couldn't mine anymore because of the difficulty increase.
So if bitcoin not worth anything to him anymore, why he will bother with mining.
Anyway, you have got enough ammo for awesome weekend, go and write the latest "Satoshi - My experiments with alt coins and Bitcointalk ALT section" It would be instant hit for sure.
Thanks for luls

Regards