What happened is that thanks to miniaturization, devices of a similar form factor were combined. The camera, GPS, phone, music player, and so on are can now fit

What happened is that thanks to miniaturization, devices of a similar form factor were combined. The camera, GPS, phone, music player, and so on are can now fit in device. There was an element of timing too. For example, the cell phone camera didn't replace the standalone digital camera until it was "good enough". A similar trend is bound to happen with tablet form devices. We've got laptops, e-readers, and tablets. There's no reason we should be lugging around all 3 if a tablet-like device can be made light and versatile enough. This device will probably have internet with built in SIM cards.