Wireless bandwidth is a limited resource...
Every time someone alludes that IP is a workable approach for wide area wireless broadcast, I find myself thinking it through and reaching the conclusion that it will never quite get there. The supposition that new technology will *always* be able to leverage more data transit out of existing spectrum has to be false. At some point we will reach critical mass and the spectrum will be saturated.
Therefore it makes sense to use a wide area broadcast technology for data-intensive applications where large numbers of mobile end points moving within a reasonable geographical area wish to receive the same data at the same time. Otherwise we're wasting away spectrum sending the same thing over and over simultaneously. IP multicast doesn't solve this because we're not talking about layer 3 networking, we're talking about mobile/cell layer comms protocols which are explicitly designed around single handset-to-cellsite channels.
IP works for TV services because most viewing is done at home, where wired broadband and local area wi-fi make the bandwidth issue less of a problem.
Is DAB/DAB+/DMB the "right" solution? I don't know; it's true that original DAB is a bit crap, but if maybe you ditch the audio codec - and almost all chipsets, and most sets, being manufactured today also include DAB+ and DMB support. DMB is big in Korea for TV, which gives it some momentum. With the right TX network, mobile reception is better optimised than anything else, including the closest rival, DVB-H.
My main problem with the current status quo is not the underlying technology itself, but rather that its controlled by the radio industry and regulated as radio (audio broadcasting) spectrum. If we go back to what the point is, technically, it's -
"...data-intensive applications where large numbers of mobile end points moving within a reasonable geographical area wish to receive the same data at the same time"
- how much radio industry content really fits that criteria? Live sport, news, stock prices, public events - yes. Automated repetitive middle of the road music playlists with DJs reading liner cards and wall to wall ads, no. A commercial radio station would probably be more bandwidth efficient by letting receivers cache the playlist and ads locally and sending the links - if they're even needed to provide a semblance of live radio - over IP.
So if you leave the radio crowd, and the audio codec, out of the picture, DAB/+/DMB actually gives you the basis of a "Broadcast IP" technology which could feed everyone real time sports, news, weather and finance content, either as audio, video, text and pictures or just metadata to feed apps.
Maybe this isn't quite so bonkers after all.