Yes, it is great what is happening on a broad scale in Permaculture. Often (especially in Australia), this broadscale Permaculture goes by other names like holistic management, pasture cropping, keyline farming etc. etc.
Even simple polycultures in broadscale ag are a great improvement on current systems.
Check out Darren Doherty et. al's RegenAg(R) work:
http://regenag.com/web/