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Just like the telephone we used today. There are so many good-designed cell phone in the world with high performance for so many years, but we still use the wired phone in our daily life. I do not think the wired phone will disappear in the near future!
Wireless USB should be self powered devices. Wireless Host cannot provide VBUS.
Now USB Forum is trying for a latest release of USB, USB 3.0 Super speed USB, with speeds in the range Gbps using optical as well as copper cables.
Wireless USB is simply a cableless repacement for wired USB. There is also an alternate Wireless USB version from Freescale semiconductors.
Well, i do believe Wireless-USB will replace wire-USB eventually. Noone like a lot of wires on your PC, and you have to connect the different USB devices with different USB connector cables. But i think that it will take about 2 to 3 years to reach that situation in the future