I've thoroughly enjoyed my Sirius subscription, and I can't imagine having to go back to terrestrial radio (with car dealership commercials every 5 minutes, it seems). Most of the music stations on Sirius are commercial free, though there are a handful of music channels that are not, and many of the non-music channels have commercials (e.g. CNN, CNBC, Bloomberg Radio, ESPN radio, etc.). I drive quite a bit, so the monthly fee is worthwhile to me. I can certainly see that if one doesn't spend much time in a vehicle that a subscription wouldn't be worthwhile.
I'm a bit bugged that some of my fav Sirius stations got changed around after the XM-Sirius merger, but that's how it goes. I've heard of a lot of XM people very upset that their fav stations disappeared and/or were mixed with the Sirius near-equivalent station. However, I understand that there is no way to perfectly combine both services, since customers of each service became comfortable with each service (and uncomfortable after such service changed after the merger). I'm happy that they at least went back to unedited songs on some of their stations.
I have to think that, given the amount of money in the infrastructure and the number of subscriptions Sirius has, there's little chance that Sirius will completely disappear. I think a Ch. 11 filing may help Sirius get out of some of the debt obligations and contracts they have (e.g. Howard Stern's, etc). I can't believe some of the money that they're giving their "celebrity" hosts, and I think a Ch. 11 filing will help them get out of those (or at least restructure them). Do people really sign up for Sirius just because of a celebrity host (Oprah, Martha Stewart, etc)? I know many folks followed Stern to Sirius, but there's a lot of money going to other celebrity hosts as well. As far as I'm concerned, the music variety and lack of commercials is good enough for me - they might as well cut ties with their more expensive hosts if it means that they can survive. I spend most of my time on Doctor Radio, CNBC, Bloomberg, Lithium, Faction, Alt Nation, Shade-45, The Highway, 90s on 9, and The Pulse (no Oprah, no Stern, etc).