To answer your question...

...by great programming, more channels and more features. Of course there is no guarantee they will, but I am personally not interested in more and more stations with even less of a barrier for advertising. Can you imagine the incredibly lame commercials we would hear every 8 minutes if there were that many channels fighting for the small space that is radio now? Arghhh... that would be ear-hell.

Don't be singing XM's swan song yet...

A lullaby for satellite radio (sleep tight) - The VoIP Weblog: "I could have a country station, an all-news, a talk, a classical, a smooth jazz, and an all-Pink Floyd station broadcast using a single FCC license on digital spectrum. Add to that the local advertising and free-to-consumer nature of terrestrial radio, and I see a triple-whammy smackdown for satellite radio.

How is satellite radio ever going to survive, I ask you?"