Shock: commercial organisations blame their failure on somebody else.
Main advantages of DAB for me: BBC World Service, BBC Five Live Sports Extra, and 192kb/s (sometimes, although 160kb/s is also common) BBC Radio 3. I listen at home (through Hi-Fi and on a portable) and in the car. The sound quality on all of these is very good - the first two are often 64kb/s mono, but that's fine for sports commentary or news and current affairs - it sounds a lot better to me than LW or MW!
As for the commercial stations, I very rarely listen to them using DAB. It is even rarer for me to listen to them using FM or AM, since those I do listen to from time to time are available on DAB where I live, but not on any analogue carrier.
So from my perspective, it would be a great shame if the fact that commercial broadcasters aren't able to extract enough money from their advertisers to cover their costs causes certain BBC channels to become unavailable to me.
Internet radio would be a solution when at home (I already listen to some internet radio stations, but the extremely low data rate and consequent low quality of the BBC live radio streams means I use DAB for their channels), provided the quality improved, e.g. 192kb/s MP3 or better. That's no good for the car, or other mobile use, though, since I don't have sufficiently cheap high bandwidth IP connectivity there!
When there is a replacement, which I can use at home and when on the move, and which improves the quality, I'll use it. For now, though, DAB seems to provide a unique combination of choice, quality, and mobility, which I would be sad to see disappear.