No doubt when Airservices complete their trials it will be deemed to be a success - its in their interest for it to be seen as such. From most reports the unicom service is NOT what is required to address traffic congestion at regional airports and that's no surprise given the restrictions of MOS part 139 - it was never going to work at busy aerodromes. The few pilots that like the service might change their mind when they find out that they will have to pay for it after the trials are completed.
What bothers me is that CASA have been very quiet on this issue - they are still the regulator of airspace aren't they ? !!! Isn't it CASA who should be conducting an independent survey into the success or otherwise of unicom services ? Airservices are no different than any other private business enterprise and their own internal "surveys" will be meaningless given their vested interest in making unicom a profitable business venture.