Chase Carey has said that Bernie was holding back F1 with his short term focus and saying no to a lot of ideas. Whereas Liberty wants to build long term value by looking to where they want to be in 3 to 5 years time.
http://classic.autosport.com/news/report.php/id/129314
I have notice there has been less comment from journalists about F1's problems in recent times I wonder is that part of the changhes that are happening.