After years of pouring thousands of dollars into Apple's coffers you expect that Linux will still be there when you need it...

Real principles would involve switching now.

a) (s)he did set out his principle - that (s)he'd switch if Apple did something found personally egregious. Isn't this a sufficiently reasonable principle to follow?

b) Linux seems pretty solid, no...?

c) I'd argue that a better position might be 'support Linux now, in case you need it in the future'.

I like Apple products and software. Why would I switch?