IEEE MACsec

[John Schiel]

I know this is a NANOG forum but curious how widespread usage of MACsec 
might be. (https://1.ieee802.org/security/802-1ae/).Currently reading 
the spec but wanted to pose some questions.

I'm seeing some pitfalls:
    1) May not work over wireless LAN devices?
    2) Needs a centralized key server.
    3) May not be supportable on all devices?
Purported to be faster on the LAN than IPsec because MACsec is on layer 2.

Thoughts?