I'll admit I am unsure how such individuals would be chosen. I imagine it would be prudent to learn what processes are used by other licensed professions when choosing such individuals.
> who write lots of blog posts and books about programming and give lots of conference keynotes
I do not think people who write blog posts and give conference keynotes should be awarded with roles that regulate the profession because they write blog posts and give keynotes. I would hope that any regulation is evidence driven.