Re: It seems it would set a precedent despite bills reassurances
-- At least if the demands are made through a (fairly?) open court system, we the populace can see what they are up to. --
What about through alternatives like a National Security Letter, or simply kidnapping someone personally important to Tim Cook or one of the other people who have access to the signing key.
Of course, it could be that Apple has a form of "Secret Sharing"
in place, to raise the number of people who would need to be compromised, but then it could be that a candidate for U.S. President who is both sane and honest will make it through the primaries. Not holding my breath.