Has oculus thought about...

Unfortunately due to the inverse square law, wireless power only works at very short ranges without being woefully inefficient or throwing around dangerous amounts of energy.

The closest thing that's likely to work for VR is high density batteries on either the headset or as something you can wear with a cable running up to the headset. In addition to the power though, you've got to get a high bandwidth low latency wireless connection for the video feed to eliminate the display cable.

The bandwidth is possible on high-end 802.11ac wireless equipment but it would add between 1-4ms of latency and probably add at least another $50 to the HMD without considering the cost of the wireless card the user would also have to have.

The problem gets worse too as the resolution and refresh rate of the HMD gets larger.

The DK2 requires:
10 bit @ 1920 x 1080 @ 75 Hz = 1.56 Gbps (and this assumes 10 bit colour not 24)

A guess at what CV1 might require:
10 bit @ 2560 x 1440 @ 90 Hz = 3.31 Gbps

Current desktop 802.11ac wireless cards top out at about 1.9 Gbps and that's assuming a perfect connection with no interference and no other network traffic. You could possibly get around the bandwidth problems with compression but then you add encode and decode latency, chew more power on the HMD, and will probably introduce compression artifacts that become far more obvious in VR.

TL;DR: Wireless power is basically impossible without new technology. Battery powered with wireless video feed is possible but unattractive due to the trade-offs involved but will probably become more viable as technology matures.

Standing near the mains isn't a problem

A guess at what CV1 might require:
10 bit @ 2560 x 1440 @ 90 Hz = 3.31 Gbps

~4.6 Gbps wireless is right here: http://www.forbes.com/sites/patrickmoorhead/2014/07/02/qualcomm-gets-the-jump-on-60-ghz-wireless-with-wilocity-acquisition/

I would still worry about latency and dropped packets let alone the other problems like

Before you get too excited about the potential of 60GHz networks, you should be aware of their Achilles' heel: range. A 60GHz signal can’t easily penetrate walls. Also, oxygen molecules begin to absorb electromagnetic energy at this frequency; that’s why existing WirelessHD devices, as well as Dell’s WiGig dock, are designed to operate in the same room. -PCWORLD

Although the Rift would be in the same room...