TFA suggests that Google Music is targeting a shrinking market, and that may be the case, but for me, its biggest problem is that it randomly freezes on my Droid Bionic, forcing me to do a complete power cycle to wrest control from it. I'd love to get in the car, start the app, tap Shuffle All, and drive, but about a third of the time that I try that, within 15-20 minutes, I'm either musicless, or sitting by the curb, waiting for my phone to restart.
Even a buggy whip manufacturer can make a decent living, if he makes and sells the best darn buggy whips in the world. Google has the ability to make the best music streaming app in the world... they just better start doing it pretty soon, or they're going to lose what market share they have.