If nobody is buying radios anymore, how can Bose afford all that
advertising? And who is buying all those Polk, BA, Cambridge, Tivoli,
Sangean, etc etc radios?

Go down to your local Fry's (or equivalent). Hi-fi table-top radios
are already abundant and rapidly proliferating. With an iPod dock,
and an alarm and maybe a CD, they make the perfect bedroom system - I
just bought the Tivoli iYiYi for my bedroom. I already have a
Cambridge HD radio with CD player next door in my office. Have a BA
receptor radio in the kitchen. Hmm, that's three radios, just for
me. Heck, I'll probably get one for my next car, and if iPod
intorduces one I'll get that too.

Samsung is (already or just about to be) sampling low-power SOC HD.
From the press release:
...features a System-in-Package (SIP) module and a CMOS, mixed-signal single-chip tuner. Target HD Radio applications include: mobile phones, portable media players, portable navigation devices, table radios and home audio-video components.

Will definitely drive costs down. Wonder if FCC might indeed start
requiring IBOC in radios - maybe phase it in like they did with ATSC
tuners in large then smaller TVs.

With the terrific programming I get free, I can't even imagine paying
for radio.

disclaimer: I worked for the engineering company that produced the
"proof of concept" receiver for Ibiquity. Yep, I helped design North
America's first ever terrestrial digital radio receiver. It was about
seven RU high. I thought digital radio was a neat idea then and I
stitll do.