Ooh, found my answer, "20 % of private cars are equipped with DAB radio." So 80% aren't. I think 80% of people are going to not like this once it happens.
That doesn't even begin to cover it, many people have an FM radio that they occasionally use for example at cabins or whatever, more than 80% will probably have to replace some radio. And note that they asked for "digital listeners" not "DAB listeners" meaning if you use your smartphone or tablet or PC to listen to radio, you get counted in favor of DAB even though you don't use DAB.
Actually this (Norwegian) is the truth, in 2014 about 64% of the population listened to radio daily and only 19% on DAB. There's no numbers for it but even less exclusively used DAB. I don't have a DAB radio. It sucks for any kind of battery-driven device, meaning just the kind of remote places and mobile appliances where you'd want radio. We'd do better just upgrading so we'd get 3G/4G coverage everywhere rather than DAB.
Nobody else is phasing out FM or even planning to phase out FM. This is just Norway going off on its own crusade urged on by commercial interests of 10+ new channels, fuck whether it makes sense to throw out millions of radios. On the bright side, I expect this to lead to a massive interest in building out 3G/4G coverage as ex-FMers give DAB the middle finger. Streaming with Spotify + offline playlists is likely to be the new "radio".