Yes, everybody wants to use 10Gb USB, but the Cypress chip isn't ready, which is why both SignalHound and Aaronia did something silly. SignalHound did 10GbE so that they could stream full 160MHz, Aaronia did double USB.
EDIT: No, SignalHound is not limited to 40MHz streaming over 10GbE. That's the USB limitation, not the 10GbE limitation. Come on, look at the dates in the thread.