Your TV does internet, XBOX, PlayStation, Wii do internet, phones do internet, tablets do internet, zeus knows what else will do internet. The PC age, where the desktop was dominant is no more, devices other than PCs form the majority of smart devices. The market is proving it as we speak. Who needs a desktop? Those who do serious work such as developing apps for other smart devices. Who doesn't need them? Most everybody else. The PC is just one device amongst a host of devices. This is what Apple and others have meant by post-pc. Apple continues to develop desktops too, so if they meant what you believed them to mean they'd be kicking a dead horse.
Speaking of horses, no one would argue that we are in the post-horse transport era, yet I can still ride a horse if I want to.