Zooker,
As far as complex/high density ATC environments are concerned CPDLC is, in my opinion, a tool in search of a use. It doesn't solve the problem of shortage of ATC frequencies as one is still required to operate in parallel with a data link. CPDLC is too slow to deal with more than routine messages such as frequency/SSR changes.
CPDLC has been around for several years. Uptake by ATC/airlines is still very low. I think that tells its own story about the extent of the perceived operational benefits over R/T.
It should not be forgotten that the promoters of CPDLC have enough influence to have been able to get the law changed inside the EU. Somehow I think those who work in ATC/airlines in the EU will be forced to use CPDLC whether they like it or not!
Last edited by EastofKoksy; 12th May 2016 at 05:54.