SIRI has competition shorting it I an sure some pandora morons are as well.
In the end SIRI will beat AM/FM and Pandora and anyone else. The SIRI business model has proven itself time after time.
It is inevitable SIRI will walk away the winner.
Ask yourself why did Pandora not stay private? Answer: because the investors who saved Pandora realized they were going to lose everything and wanted their money back. How else do you think they would get back their money?