Ready for developers to port developer tools =/= ready for all developers. Systems dev is actually a fairly niche role in the industry, M1 will be a boon to them but for the vast majority of devs who either aren't interested in that kind of work or not trained in it, M1 is a huge monkey wrench.

I buy a new MPB every two years, and you bet your ass my next one will be an M1. But that'll be in 2022, I'll be quite happy to stay on my x86 machine until then :)