Sonos already provides an Internet connection to your local radio stations via a plethora of plug ins. And, if your station has an Internet stream, and isn’t ‘on’ a service, you can add it via the instructions on setting up an internet radio station FAQ.
 

Not sure why they would want to leave their expertise as a network device to include a ‘receiver’ to their electronics. Sort of antithetical to the way Sonos works. You’d need to set up a separate, new device, that takes an over the air signal, digitizes it, and send it across the network, which is essentially what all the various streaming companies that do ‘local’ radio already provide via their Sonos plug ins. 

Choice of stations would be limited to the immediate geographic area and over the air transmission bandwidth is much less than is possible with Internet transmission.

Yup the local area would be all you can receive which would be fine by me and I’m assuming a lot of other as well.  Sort of like OTA antenna TV. Lots of people use it and bypass cable or satellite tv altogether.  Seems like there’s plenty of manufactures that make HD radio for vehicles, but not so many when it comes to at home receivers.   Wonder why this is.   

There’s no need to wonder, you were told  exactly why in the posts above.  Virtually every home as high speed internet and can access all the HD radio status through that connection.  Those that don’t have internet are likely not in the market for HD radio anyway.