While I'd prefer the coins to not be dumped in one go but instead in increments(as to not dramatically flash crash the market), why should we stop Satoshi? It's his coins, from his own creation. He/she/they have every right to dump every single one of the bitcoins if Satoshi wants to. It's a free and open market.
I hope they do.

Convince him then. Best of luck.
@mjglqw Ill second that its his coins and he can hodl them or sell them its his personal decision hes not answerable to the community. While I have no objections if Satoshi were to sell his coins I only hope he doesnt sell it in one go, otherwise itll completely crash bitcoins market forever. @Timebits whos they do you actually believe Satoshi is a group of persons, and not a single person care to share some proof?.