In recent Chad's interview to Drum Magazine, he told his felling about John Frusciante departures.
Chad Smith told:
“I thought he might come around one day and go, ‘Yep! I’m ready!’ But he never did, and that’s fine,” Smith says. “He’s probably the best musician I’ve ever known and played with. He’s just fantastic and I love him. But we want to keep going.”
Source: invisible movement