There are two things that will help this be successful:
1.) Compatibility with the Zune Marketplace
2.) Compatibility with Xbox Live Arcade/Marketplace downloads
If they can successfully find a way to do this, I think it can take off. Imagine being able to play any or most of your XBLA downloads on the go and all this while listening to your own tunes from Zune.
Author of science fiction and other genres, I write under the pen name Desmond Shepherd. The second season of my series The Permanent Man premieres on November 11, 2014. Pre-order the season premiere The Walls Have Ears on Amazon today!