A better move might have been to ship it with a USB-C/Thunderbolt cable, and a small adapter for USB-C -> USB. That way it still works out of the box, they get

A better move might have been to ship it with a USB-C/Thunderbolt cable, and a small adapter for USB-C -> USB. That way it still works out of the box, they get to keep their dongle eco-system and it pushes the new USB-C standard and accordingly both the Macbook and Macbook Pro.