> significant work by third parties outside Apple who haven't even heard of the possibility of this happening until today

I dunno, I feel like the writing has been on the wall for Apple to switch to their own ARM chips, for 3 or 4 years now. At first it was "yeah maybe someday", but by this point, I'm just surprised they're waiting until 2020. I was hoping the first ARM Macbooks would be this summer. (Really, last summer, if I'm being honest).