Anyway, one question that pops up is the issue of real time met instrumentation feed to the ATIS machine. What would be the pros and cons of reporting winds as of the moment?
They are only two values which could be directly fed to ATIS - winds and RVRs. As for the winds, they need to be accurate and current only for approach and landing. I doubt if any crew will be listening to ATIS then.
RVRs is bit different story. It usually changes slowly, but a change of 25m may be the border between approach and divert. However, instant RVR is fluctuating sometimes and needs a good averaging to make sense for ATIS report. Over FAP, when final RVR check can be made, ATC will provide instant RVR on request.
So in my opinion (as ATCO) live feed to ATIS is not helpful. Frequent changes of ATIS designators could also be a hell for us. But maybe there's need for separate frequency with wind/RVR data only?