Not long ago, "everyone" was telling us how the economy had fundamentally changed, only because some day traders were raking in millions for a short period of time. But in that time, these pundits couldn't see that the free-for-all was a mere blip in history, and that the economy would soon stamp out those who provided no added value to it.
Today's blip is handhgeld gadgets, and the pundits seem to think that these handheld toys are all there is and all there ever will be in the future. So if a technology doesn't immediately apply to the toy, that technology is supposedly "in decline."
Ethernet speeds keep going up because the carriers are using Ethernet in place of SONET, for their trunk lines. And the demands for capacity of the trunk lines and in all manner of core ISP networks are still going up. As people migrate their TV watching to the Internet, I can only predict a more demand for bandwidth in core ISP networks. So there's no question in my mind that Ethernet has to continue to grow, and that 802.11 is simply a different discussion, for a different set of applications.
IEEE 802.11 is merely a last-few-meters connection link. It ain't the main event. It is cabled Internet networks that do the heavy lifting.