The rather silly thing about all of this is that the decision to expand European FM Broadcasting was made at the World Radio Conference in 1978 almost 23 years ago. The improved specification for aviation receivers dates back to a similar time however, the majority of equipment in current use is based on a specification dating back to the 50s. One has to ask what have the avionics companies been doing for so long, all modern equipment should have met the required specification years ago. As for AOPA they have done little or nothing at all.
The original plan did of course assume that by now ILS would have been replaced by MLS.
Any potential problems could still be resolved by planning frequency allocations, not a very difficult task. As the predominance of FM transmitters in the US far exceeds the number in the UK and their proximity to airfields is considerably closer, I would have expected the problem there to be greater rather than less.