It looks like the kit you've linked to can do that already -- if you have multiple "hubs". If you look, what the kit consists of is two different products:
- A USB dongle called a "host adapter"; this plugs into your computer and provides the "Wireless USB" connectivity.
- A 4-port hub that connects via "Wireless USB" to the host adapter.
Since they are sold separately, you could have multiple hubs connect wirelessly to the same host adapter. These products are "Certified Wireless USB", operate on the Multi-band OFDM Ultra Wide Band (UWB) 1.0 specification, and should be interoperable with other "Certified Wireless USB" products. Wireless USB can allow multiple computers to share devices, but device access is one-at-a-time. There's no indication that the hub is "paired" to a specific adapter.
Edit: Actually, I may be wrong; the IOgear site lists pricing for the kit and the adapter, but not the hub. I believe this demonstrates a marketing strategy of "sell one adapter with every hub, and extra adapters as needed".