If you need expansibility and are running a large external monitor, that sounds pretty 'professional' to me.
http://store.apple.com/us/product/MJ1K2AM/A/usb-c-digital-av...
and
http://store.apple.com/us/product/MJ1L2AM/A/usb-c-vga-multip...
Unfortunately both only have 1080p HD. Let's hope there will be a (mini-)DVI version with a higher resolution soon.
So we have the "USB-C Charge Cable" $29 (http://store.apple.com/us/product/MJWT2AM/A/usb-c-charge-cab...) -- I wonder if that is proprietary or if any cable would work. Then there's the "USB-C Power Adapter" $49 (http://store.apple.com/us/product/MJ262LL/A/apple-29w-usb-c-...).
Too bad they can't fit 29W into the smaller cube form factor which charges my phone. That would be incredible powering a laptop off of that.
Someone needs to create a much sleeker implementaion of a in-line 1-port hub. So basically something that looks like USB-C on both ends, but 4" from one side of the cable there's a quarter-sized circle of hard plastic that has the USB-C cable going through it, with another USB-C port available on the side.
I hope we will see USB-C to HDMI and USB-C to DisplayPort "cables" which are not big fat massive dongles but really function more like just a cable.
It wasn't addressed because Apple offers no solution (yet?).
They're way too expensive ($80), but give Type C is a standard port I expect Amazon Essentials or Monoprice will fix that pretty soon.
They own Lightning themselves so they can do whatever they want there.
Another perspective I've seen recently about this is that this new Macbook will probably make people change their habit towards something traditionally only for smartphones: you'll see people keep their computer untethered for the larger part of the day, and only plug it for energy during the night. So, basically, mobile first instead of plugged first. You then have a port constantly available for whatever you want to plug on the go.