TimeLock coupled with our Steemify app to receive an instant notification of a powerdown on your account would be supersecure ..

I for one think this is a very good idea ... 2FA is everywhere and with holdings as large as yours (but as low as mine as well with current steemprice) would benefit greatly from the extra security

Perhaps the TimeLock could be a length of time chosen by the user itself even. Allowing for some flexibility.