It's very dangerous to rebrand because of how much you lose vs how much you gain. IBM makes bugger all money from "International Business Machines" these days but they wouldn't want to lose a brand everyone knows. Same for "Carphone Warehouse" in the UK, they don't want to lose the recognition despite the fact no-one has called a cell/mobile phone a car phone in 2 decades.
And Microsoft's stuff certainly isn't small. (*sidesteps hook*)
So despite the lack of "Radio" as their main business, they should REALLY look and see if the number of people who say "I don't need a radio I won't go there" might be outnumbered by the people who will end up saying "What the f is "The Shack"?". It sounds like somewhere you'd buy a very dodgy Hawaiian style shirt.