How long before PC's ship en masses with USB-C? Keyboards, mice, scanners, cameras, printers, Android phones, etc. It'll be nice to finally have a small reversible connector.
It'll probably be a few years, and it'll probably start with the front ports and hubs before the rear ports start to get changed over. USB's got 20 years of devices to support, and a lot of people would rather not have to get all new cables for their existing devices. Though I do foresee that things like mice and keyboards will ship with A<->C dongles for a few years, much like the USB<->PS/2 adapters of 15 years ago.
Yes, the Mac had USB about 5 years before it became popular on the PC. However, you aren't clear as to why they can't simply throw in a couple small USB-C connectors now. No one has to buy new cables. You'll still have all those legacy ports.
Aren't almost all of those things normally wireless now? Apart from charging phones.
Quite a lot of phones support wireless charging these days.
Which, the newest 2 Nexus phones and the Palm Pre? 0 iPhones can do wireless charging, and those are pretty popular. Wireless charging still also requires a big dock thing to be plugged in to USB or mains power; it's not as if all (or any, that I'm aware of) laptops have a built-in zone which charges anything you lay down on it.
The Galaxy S6 and a bunch of others, including some HTC Droids, 8X and others, LG G3, many Lumia devices, Blackberry Z30 and Classic. But yes, not the iPhone.
I don't see a lot of wireless mice in PC-land. They exist, but don't seem to be as common as with Macs. I did have one for a bit, but switched back because it ate batteries way too fast.
Batteries last very-very long in many mice designed for PCs. The biggest reason I'm sticking to a wired one is weight and response time.