Intel recently announced they are stopping development of 802.1ad hardware. Intel said that the demand for 60 GHz hardware was smaller than anticipated.

802.11ad uses 58-64 GHz which is unable to penetrate walls so its very limited to larger rooms with line of sight access. By comparison 802.11ac uses 2.4 GHz which more easily can penetrate wood and concrete walls which provides enough bandwidth for mobile devices and media streaming.

802.11ac has all of the advantages of 802.11n with the addition of 5 GHz operation for situations that can take advantage of it. 802.11n and 802.11ac can support 150 megabit services easily. 802.11ad is designed for higher speeds that are not widely required by consumers with hardware and services available today.

802.11ad hardware is available but it appears as though this will be more of a niche market. Intel needs mass market products which is the reason they have abandoned it.

802.11ax seeks to improve throughput over 802.11ac in more crowded areas which is now being developed by several parties. This will likely have mass market potential as many in dense urban areas would welcome better Wi-Fi performance.