Pandora had to do this once before on the web version of Pandora. I don't remember how long they had the cap for maybe a year or two. When they started making money again (when the phone app was created and took off) they took away the cap online again.
The fact that they had this cap before and then repealed it made me a believer in Pandora. 99% of companies once they implement something would never repeal it if it would cost them money. So Pandora, IMHO, is a company worth investing in and sticking with.