In reply to Nic:
So to answer the question, "do I really need it."?
Basically wired connections will be faster and more reliable for things that have network ports. Printers, Desktops, Laptops, Games Consoles etc.
You'll still need a decent wifi network for your phones, tablets etc.
However, if you have an ok network, then yes you can just get rid of it. Personally I wouldn't, but if you don't like it and your wifi is good enough, then get rid of it.