I think already there is de-skilling taking place. Certainly the en-route trainees coming through now know how to use the kit, but don't have great radar skills and aren't very efficient as they can't think outside the box.
I can't see how flying a continuos radius is fuel efficient, especially if you have to plan (upload fuel) to fly the entire approach, which I believe requires a/c to be lower sooner than now anyway. It just seems like it's being brought in because it's 'fashionable' and a
PR tool. I remember someone saying it cost EIN €2 million a year extra in fuel, just for Dublin.