Hmmmm, Envy Me over Ethernet...?
Solarflare's idea of NVM over TCP looks interesting for distance applications (DR and BURA), but I think the drop in transfer rates over a WAN will be horrific, especially as TCP is not a storage-optimised protocol (which is why we ended up with iSCSI). And then there's the same problems with any storage-over-the-network technology, number one being aptly described by Brocade's Mark Detrick as "The storage guys don’t go to lunch with the network guys. You know what I mean, right? OK, think about it…"