Wrong way round
Ofcom should have said the hardware was to be DAB+ only years ago before allowing DAB+ radio stations. The economies of scale for manufacturers would have been there as several European countries use DAB+ too. Either current manufacturers get firmware updates out for existing DAB kit (not that they have much incentive as they want to sell more kit) and advertise it well enough that the average person will understand or the DAB+ stations will wither and die.