I'm racking my brain to think of the last time that I used the ADF for anything (apart from getting the Cricket scores).
In all the practical IF that I do the ADF is not used because the Area Nav will do the job of getting you to an NDB better than the ADF will, for legal reasons I may well tune the ADF to the station.
The big problem is that if the requirement for ADF is dropped some of the NDB approaches will be withdrawn and the way things are going in the UK at the moment these approaches won't be replaced with GNSS (GPS) approaches.
Having started using the GNSS approaches for real now I find it hard to see why the authority's are taking so much time to bin the ADF once and for all the safety case alone must be compelling.