Kind of late to the party, and I haven't watched the videos yet. What do we know about John Ternus's background? Is he another "bean counter," an engineer, or more of a creative/product guy?
You're right that Cook's tenure didn't bring excitement in the way Jobs's did as CEO. I'm not sure anyone ever could match Jobs in that regard. The reality distortion field was strong with that one.
But for all of Cook's faults, it's hard to argue with what he accomplished operationally and financially. He didn't just keep Apple stable; he's leaving behind an enormously profitable company with tremendous resources.
So if Ternus turns out to have more of the product vision and willingness to take risks that people have been missing during the Cook era, he's inheriting Apple from an extraordinarily strong position. Cook may not have been the guy to disrupt entire industries the way Jobs was, but he may have given his successor about as much financial freedom as anyone could ask for to try.
I think this could actually be a good cycle for Apple: a visionary genius, followed by an operational and financial genius, followed, hopefully, by another visionary CEO.