The fact that 6 still isn't broadcast over the airwaves is unquestionably the greatest injustice facing mankind today. I'm not even joking.
But it is. I listen on a little bedside dock/radio, and at work I have a little portable that will fit in a large-ish pocket. There's no wifi, so no Internet radio, so it must, therefore, be broadcast over the airwaves.
So it's a digital signal. There were stations on AM that were never transmitted on FM, and there are many more on DAB.
The fact that most are utter trash, like Kiss FM, is beside the point.
I'm just being picky, though; I do agree that 6 ought to be on a non-digital band as well, although there's an argument to be made for keeping it DAB, as it gets more widely known, to encourage more take-up of actual DAB radio sets.
Putting DAB/DAB+ sets in cars as standard would be a good start...