The whole car radio situation hasn't be handled correctly by politicians, at least not here in Denmark. When regular service began, in 2002 in the case of Denmark, politicians should have parsed regulation that required all new cars to be delivered with DAB radio within a certain time frame.
You can get a DAB/DAB+ radio in your new car, but you'll have to pay extra. At this point is should simply be the default, otherwise a migration will never be well received.
I agree. Here in germany it was also planned to shutdown FM in favor for DAB already for 2010. It was then canceled and postponed due to the fact that nobody has a DAB receiver.
But of course nobody wants to get a DAB receiver as long as they cost 200€ extra, and therefore FM is still the standard in cars. As cars have a super long lifetime that means every car that is now sold with FM works against a FM->DAB switch in 10 years. So even the new plans like "we switch FM off in 2025 if the majority has a DAB radio then" won't work. There should now (or even multiple years ago) have some regulations that car manufacturers have to offer DAB for the same price as FM to get more traction. In the meantime building DAB receivers is often even not more expensive than FM if both are build on top of a software defined radio. However car manufacturers still sell DAB extra for maximising profit.
BTW, technical requirements for cars are EU-wide. Country specific requirements for "a car sold here must have a DAB radio" are an illegal obstacle for free movement of goods, or a state subsidy to domestic industry.
So, DAB radio won't be in all cars unless DAB radio is an EU wide requirement. Not happening overnight.
Requiring things like winter tyres is OK because they can be installed separately. I'd be happy to insist that all cars in EU must have block heaters and cabin electric outlets, it would surely reduce prices here a bit.
Over here (Finland), a car is not required to have a radio at all.
In fact, even speedometer only became mandatory in new cars in 1984, so cars older than that are legal without one.
(Otherwise, the authorities here have been ridiculous with car equipment requirements, particularly before EU time, as they wanted to ensure the revenue collection from car taxes. For instance, one year third brake lights were illegal as "dangerous", then very suddenly at the time of EU membership they then became mandatory in new cars. The authority is still in constant breach of EU rules, and the authorities do nothing; officials break the law and there are no, zero, zilch consequences.)
You can get a DAB/DAB+ radio in your new car, but you'll have to pay extra. At this point is should simply be the default, otherwise a migration will never be well received.