What about Blade Servers?
Disclaimer - I work for EMC and have spent the past 7 years working on FCoE.
While I would agree that end-to-end (Server to Storage) FCoE never achieved widespread adoption, I disagree that FCoE is dead. Both HP blade server and Cisco UCS-B series customers use the protocol heavily and there are some compelling reasons for them to do so.
I also disagree with the notions that:
1) FCoE somehow legitimized IP Storage. They have been evolving independently of one another.
2) Enterprise customers are moving away from FC (in general). I've explained my reasons here: http://brasstacksblog.typepad.com/brass-tacks/2015/05/fibre-channel-is-better-than-ethernet.html
I also think DCB is merely a distraction for IP Storage. It adds a ton of complexity to the end-to-end configuration process and the value it provides is not significant enough to justify the extra complexity.