You've all heard me rant about how media players are going to continue being one of the preferred attack vectors for the bad guys who want to compromise systems. Apparently Apple is tired of that truth and decided to do everything they can to stop it happening via QuickTime.
That's only to the good. How well Apple will succeed is open to question, as it appears [to me] that applications like media players are simply going to be vulnerable. Giving their best to these changes can only help users stay secure and, if they are really good, they might achieve a long period of "peace" where no new vulnerabilities are discovered for a while.