I am of the opinion that 'HD Radio" will be staying in automobiles. I have been tracking it for some time now and there is a growing consensus that internet broadband is the better source for digital music.
Sonos and Slimdevices(I own the Slimdevices Squeezebox as well as the Transformer) seem to dominate such internet server markets.
You can search the Audiogon archives on HD Radio. Oh, the name 'HD' stands for, I think 'Hybrid Definition'.