I'll leave alone all of the comments which imply I don't know what I'm talking about and that I'm not very smart, suffice to say you don't need crazy secret sharing systems or bank deposit boxes or anything of the sort to prevent this attack.

A dead-simple soft-wallet, which requires about 2 steps to setup and 2 more to transfer and hold your millions of dollars in, would have prevented this. Roughly 15 minutes of time, at most.

You don't need to be the NSA to secure your crypto, as you seem to be implying.