FC is still much more expensive per meter than copper. A 6m length of LC-to-LC fiber is over $300 while 6m of CAT6 will run you around $3.
Consider 10GBps interfaces are becoming standard on most Cisco chassis, I don’t see this being widely used unless and until these are integrated into blade chassis backends or entire datacenters are refitted with fiber interconnects.
This is, however, pretty badass tech.
Someone will decide they just have to have the incredible speed and will pay for it.