ответ одного CCIE:
I asked this same question to some folks at Cisco when the CCIE R&S 4.0 update was released and it still had FR in it. Their response was basically that companies they polled that want to hire Cisco Certified individuals still want candidates to understand FR. I know of a few networks that still use frame relay today, but for most people the functionality has been replaced by MPLS L2 and L3VPNs and metro ethernet as you say.
Personally, I've never worked in a production environment that used frame relay, but I still know it because almost all of my Cisco certifications - including both CCIE tracks - required me to know it.
