This is not about supporting printers on a Media Centre. USBIP allows sharing any usb device over the network.
Imagine you have a printer, scanner, toy, camera or whatever close to your TV and Media Centre without any other computer nearby to connect it to. You could connect this device to your Media Centre and allow one or more Linux computer access to this device over the network with USBIP.
For these Linux clients it looks like the USB device is directly connected to them. USBIP is transporting the data on the USB bus transparently between the Media Centre and the client. The Media Centre doesn't need a driver for the USB device, this is entirely handled by the client.
I hope this helps to understand the use case for USBIP a bit better.