I commented elsewhere in this thread theorising that Satoshi could be the work of both Finney and Back. If that has any basis in reality, then it stands to reason that perhaps the wallet is locked away in a trust or at least legally unobtainable until certain conditions are met (e.g. Adam Back's passing). I can imagine a scenario in the future where a law firm makes a press release confirming they're in possession of Satoshi's wallet and have been instructed to liquidate and donate its proceeds.