My issue with CPDLC is the significant potential loss of spatial awareness for flight crews. At the moment if a crew is just hearing 8 inbounds being given the STAR they are on then there is a nudge that they may get a delay or that the sector is busy. Do it on CPDLC and that hint,awareness or whatever you want to call it is gone. I suspect the use of CPDLC will be extremely limited or even nada.