I originally bought a pocket DAB radio because four stations I listen to were in stereo on DAB, two of them were on AM (mono). As time passed by, ALL the DAB stations dropped their data rates, two of them have switched to 112k mono - unlistenable so don't listen to DAB any more The other stereo station on DAB reduced from 192k to 128k. Only one station left in stereo, at 160k (thankfully is in stereo on FM).
99% of DAB radio is in mono - in no way is that an FM replacement, the dropping bitrate makes even the mono stations sound bad. Look at the DAB radios on sale in the UK, nearly all of them have just one speaker. DAB is NOT ever going to replace stereo FM.