BigMack, while you are probably correct in the desktop / consumer market, for enterprise, more speed is always better, and there will always be cards ready to take advantage.
I just spent several hours in a meeting explaining why a 4 port fiber card wouldn't be any benefit in several of our servers due to their PCIe 2.0 spec. There just wasn't any more speed coming out of the PCIe links. Moving to PCIe 3.0 would have removed that bottleneck, but that means buying a new server. With a 4.0 slot, I could run quad 16Gb links without a bottleneck.
(assuming the cards at 8x electrical... which seems to be a pretty accepted standard for both the server cards and motherboards.)