> I am sure that the built-in Intel Ethernet ports on most motherboards have made Network Cards obsolete at least for the Home Market.

Someone is still making a NIC chip, they're just selling it to the motherboard OEM, instead of selling an add-in board to the customer (or selling a chip to the add-in maker). In a way, this is more sales, because desktops tend to come with a wired nic and a wireless nic, and so do good laptops.