Both XM Satellite Radio (NASDAQ:XMSR) and rival Sirius Satellite Radio (NASDAQ:SIRI) have seen their stocks tumble recently. Will a merger improve their reception on Wall Street? And what is the future of radio? How much of a threat is Apple's (NASDAQ:AAPL) iPod? In this installment of "Fool Video," I ask best-selling business author Seth Godin, author of The Dip: A Little Book That Teaches You When to Quit (And When to Stick).

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Mac Greer is an XM subscriber but doesn't own shares in any of the companies mentioned.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.