ARS Technica takes a look at the future of WiFi, you can read it over here. The site says wireless transfer speeds of 1Gbps and more should be reality within a couple of years.
In a couple of years, crossing the 1Gbps threshold with a WiFi access point will be routine. That access point will likely have two radios, one for each major spectrum band, and support a host of older flavors for compatibility. Eventually, WiFi will approach the robustness and speed needed to make it a completely viable replacement for Ethernet for most users.
In today's pipeline are optional enhancements to 802.11n that have been in the works since the standard stabilized at the IEEE engineering group nearly three years ago. These enhancements will increase range and performance by up to a couple orders of magnitude, offering raw data rates of 450 Mbps and 600 Mbps.