100%, or even 80% mask compliance will never happen in the US. Full stop. To suggest at this point is just a badly designed engineered solution/mitigation strategy; one wonders why it's still being discussed.
A decade ago (ish), a routine Christmas story was someone(s) getting crushed to death pushing through store doors with the crowds on "Black Friday". If everyone would just que up in a orderly fashion and wait their turn, well, problem solved! Except it never worked, because all it takes is one person coming in just a bit too fast, and the entrance becomes a venturi, people get compressed at the choke point, and someone who can't breathe pushes the person in front, who does the same to the person in front of him, someone falls, and the mass literally can't be stopped.
Better engineered solution: wider doors. MUCH wider doors, with multiple entrances. (Better long term solution: Invent Amazon and crush all other retail, so no one goes shopping anymore on Black Friday)
This used to happen routinely every year during Ramadan and the Hajj...lots of people crushed to death. Someone finally hired a British engineering firm in, swore them to secrecy about what they saw (as they were infidels), widened all the entrances/exits/hallways up..problem solved.
TLDR - High mask compliance as a mitigation strategy in the US has failed, and will continue to fail, especially if it requires 80%+ compliance. Masks as an engineered solution is terrible, and just cajoling everyone to "wear your mask, but harder!" is a complete waste of time. It's not politics, it's not science, it's just reality.