Okay, as we all know, the cap that prevents Harmonix from releasing more than 5 RBN tracks per week was made by Sony. Now, Sony has a section on their blog allowing people to submit and vote on ideas for Sony to work on. I was recently reminded that I had submitted a vote to remove the cap, found here. With enough positive response, it's likely Sony will either raise or eliminate the cap.
So, please help vote so that we might have a stronger RBN on the PS3