No Chicks here.
The momentum for any musical group is radio airplay. You take away that and you've removed their power source. If people don't hear you on the radio then they don't know about you and don't buy your music. That's why the recording industry spends millions every year to get their groups' music into radio rotation.
Momentum is a funny thing--you can remove the power source and an object will keep moving....for a while. The Dixie Chix are roaring down the freeway with the wind in their hair, but if they listened real close they might notice that the engine has died and they're really just coasting.
Tell that to the "Phish" guys.