Trouble is you'd need something that produces that much random IO either within the server or on 4 10GbE links to take advantage of this properly so it seems a bit niche. No more niche than a lot of current high end hardware mind you, servers seem to be big enough these days for most normal purposes. I guess animation and CGI maybe would use this? Very busy non distributed databases? I'd love to hear what everyone else can think of that needs 750k IOPS in a single system.
The evil that is VDI will of course use every IO it can get its grubby mitts on, but I shan't count that because those IOs should be in the ruddy end point ;)