Satellite Radio - business model in question

Satellite radio's business model does not seem to be a winner currently. Especially within the automotive industry, it seems that subscription service should be dropped in place of manufacturers striking deals with XM/Sirius to provide seemless and continuous service for people in their new cars. But as Cable TV never overtook network TV, Satellite won't replace FM/AM. There have also been questions about podcasting taking over satellite radio but there are high costs in terms of acquiring content and then the time it takes in transferring it.