The ATRiCS demo system I have seen at the World ATM Congress in Madrid proposed a taxi route that takes into account wing span constraints, closed areas and also other traffic. I've been told that in most cases the controller (GMC for outbounds and AIR for inbounds) just needs to confirm the proposed route, see
ATRiCS TowerPad on Vimeo
The guys from ATRiCS told me that their system is in use in Incheon (RSKI, South Korea) since 2008 and for the inbounds the controllers wanted the taxi route to be assigned fully automatically.