adma said:
....no longer bound to terrestrial or Arbitron or archaic ad-buyer logic...
Any medium that is ad-supported will have ratings, whether Arbitron or Nielsen or something yet to evolve. And ad buyers will continue to follow faithfully the mandates of their clients, who will have the same kind of research... just more of it... showing the best and most efficient sales demos for ad targeting. In other words, the very same thing we have today!
And the providers of the most successful content will be the same folks that bring you terrestrial radio today... because some kid with WinAmp and a streaming provider can't hire Ryan Seacrest or sign a $50 million contract for a multi-year baseball broadcast, to name but two examples.