“How close were you to not doing ‘High School Musical 3?’” Billy [Bush] asked Zac. “It’s time to be honest with Uncle Bushy. You thought about it!”
“Oh gosh. No, seriously I am not going to be the guy who takes ‘High School Musical’ away from all the fans,” Zac said. “We owe everyone too much. ‘High School Musical’ is a project I hold very close to my heart and I am going to complete the franchise.”
The rest is sort of rehash of previous 17 Again and other interviews so I'll spare you the redundancy.
There is now video.