"Apple is fucked in marketing terms and brand loyalty"
There are going to be some iPhone owners who think they are completely wrong, and will become former iPhone owners. There will also be some non-iPhone owners who think Apple is 100% right and will become new iPhone owners because of their stand.
I think the "Donald Trump boycotters" and the "standing up for privacy switchers" (or that huge market of terrorists and pedophiles some idiots claim Apple is trying to attract) will pretty much cancel each other out, so I don't think this battle will have any noticeable impact on Apple's business.