The main problem with 10Gbps and beyond is that involves a lot more hardware to reliably transmit data over metal in any significant distance.
Pretty much the same statement could be made about every new generation of networking technology introduced since the era of dial-up modems.
The masses prefer wireless ethernet solutions.
"Wireless Ethernet" is an oxymoron; Ethernet is wired by definition.
Semantic nit-picking aside, you do have a good point. The shift in emphasis to mobile means that most consumer devices sold these days use Wi-Fi as their primary network connection. Ethernet will become increasingly niche, which will keep prices of bleeding-edge gear higher longer since it will be used primarily in commercial/enterprise settings.