Show me one company that thinks emulating Pandora's business model is a good idea. Just one. No sane businessperson would look at P's financials and think "hey, let's lose money like these guys". Most other streaming services charge a monthly fee (much more than P charges) and those that don't run far more advertisements. P's business CAN NOT survive if they refuse to change their business model. Crying to the government to reduce their expenses will be a failure, and Pandora will wither and die.
Also, artists do not make millions as you claim, particularly from companies like P that wish to give away the artists works for free. A few artists make decent money, but it's not from services like Pandora that pay fractions of a penny per song played and are begging to pay even less. Musical artists make money from live shows (ticket sales), and digital downloads/CD's/merchandising.