Considering that only one runway (28R, IIRC) at SFO even winks in direction of supporting autoland, and there's no continental USA support for controller-pilot datalink (only used for oceanic flight), at least outside of test flights (correctme if I'm wrong, not an expert here).
On top of that current CPDLC doesn't seem to be as well integrated to autopilot support other than pilots acking each command, and then I do not think Mode S is mandated (or exact enough) to provide good enough separation.
On top of that current CPDLC doesn't seem to be as well integrated to autopilot support other than pilots acking each command, and then I do not think Mode S is mandated (or exact enough) to provide good enough separation.