Pax, the problem is that the LHR RNAV trial was just that, a trial. I'm not debating the whys and wherefores, but should a trial have a full consultation? Interesting question. The trial was needed to gather data to determine how close together departure routes could be whilst still considered to be separated from each other. This could lead to respite departure routes in the future, but without trials to gather data they most surely will not happen.
A related issue was that Heathrow found, during the earlier 'Operational Freedom' trials, that people started complaining about them months before they had even started, due to the publicity put out by Heathrow.
Damned if they do, damned if they don't, in many ways.