They are telling the industry to choose one common connector, and to standardize around it....
They are not dictating which one.... and that the one they choose has to be set in stone (i.e. never change)
De facto it is going to probably be USB-C, and I think it is a good move....
If years down the road, there is a new connector called USB-D (or whatever it is called), they can switch to it.... Also, this is for charging, and not data..., so it shouldn't hamper adoption of new data transport protocols.