I'm pretty ambivalent about everything but the usb ports. I get they its an overloaded standard and probably needs a replacement, but its a lot to give up in the name of progress...
The hard fact is that there's still a LOT of usb devices out there. Even one USB port would greatly alleviate the pain.
If they don't include a usbc->usb+hdmi adapter in the box, it's going to be extremely painful for users with workstations who find out that their peripherals don't work.
That's what people said when the very first iMac replaced ADB and Mini-DIN8 with USB ports. This isn't even exactly replacing the USB standard, just the connector type. USB1/2/3 devices will still work, you just need a Type-A to Type-C adapter; much simpler than, say, Thunderbolt to FireWire. The best outcome will be a "rip off the Band-Aid" approach with everyone else adopting USB Type-C (or Thunderbolt 3) as quickly as possible.
If they don't include a usbc->usb+hdmi adapter in the box, it's going to be extremely painful for users with workstations who find out that their peripherals don't work.