The issue for broadcasters is that performance royalties can cut into their profitability (which is still high for many stations even in this lousy economy, even poorly programmed ones that are little more than iPods with commercials and little value added--although the good ones get better return on investment even if they cost more to run).
Of course, if the performance royalties are set at the same levels per song play as the songwriter royalties our business has been paying for close to 80 years now, it's not all that much added expense, certainly not enough to turn any profitable, well run and well programmed station into a loser. Will it turn any music station into a talker? Will it force any station to go dark and turn in its license? Maube a really marginal station or two will change format and maybe an even more marginal operation which can't hack it will shut down for good. That kind of station wasn't going to last much longer to begin with. The business is better off without them as stronger, better programmed, higher quality operations get more room to thrive (and less trouble with interference). Maybe performance royalties might be a blessing in disguise by weeding out operations destined to fail, leaving the field to serious players.