What good would it do ? Thunderbolt is not a network interconnect.
I am more thinking about the multi-host multi-path capability. But I am not seeing any real easy way around the 6 devices per chain limitation. If you could get around that you could potentially make switches and have your storage connected just like you do for a SAN now (ie using a totally separate bus versus your production network, so really I am thinking about a FC replacement more so than an iSCSI replacement).