To me the greatest disappointment is that the prime driver for BEA being in the forefront of this technology was to improve the reliability of their trunk domestic services operating into Heathrow during poor weather conditions, hence why so much BEA money and management time was input.
Roll on to nowadays and Heathrow is now so squeezed for throughput at all hours that with the slight reduction in runway capacity required for such low visibility operations, those very same (now BA) domestic services are always the first to get delayed or binned completely whenever conditions fall to those which inspired this development in the first place.