Isn't it only dongle hell for a few years? Theoretically monitors, printers, hard drives, etc will all have USB-C connectors as well at some point.
Do all monitors/printers/hard drives/etc provide pass through so you can charge? Or do you have to unplug your laptop from the power to get to your hard drive if you lose your dongle?
Not to mention the fact that every single mac apple peripheral you've ever owned is now worthless.
If they threw USB-C on as the charger alongside a USB and Thunderbolt I'd be stoked that mac is embracing new technology. If they put two or three USB-C ports and nothing else I'd be impressed with their commitment. With just one port, I'm left wondering what the hell they're thinking people use their laptops for.
[1] http://www.newegg.com/Product/Product.aspx?Item=9SIA2TY1K447...
Also, I haven't plugged in a printer in years. Many printers have Wifi built in, and if not, you can always attach it to an Airport base station.
External storage? Use Apple's Time Capsule or any other NAS to back up your data wirelessly.
I've even seen companies use Apple TVs connected to a projector for wireless presentations.
Sure, a USB thumb drive is invaluable when you need to copy some files to your uncles 10 year old laptop with broken wifi; but you can get pretty far without wires if you want.
This was back pre-USB 3, and the power limit of USB has only increased since then (USB 3, USB-C, etc). This means the wires get hotter, the hub gets hotter, and any short/surge will have an even more dramatic effect (e.g. fire?).
Honestly USB hubs should be up to the same spec as a surge-protector/multi-tap, but they aren't, even though they carry enough electricity to kill someone.