I switched to DAB for the last world cup as commentary on AM is unlistenable. I've never looked back.
People don't seem to replace radios like they do TVs. Most council dumps are full of CRT TVs that are quite serviceable with a digibox, but go into most peoples houses and look at their radios, they go back 30 or more years.
A friend that's in the dental technicians business even has an old Bakelite set in his workshop that he listens to Radio 4 longwave on!