I have to word this one carefully.
I think he can turn them around and win one, yes. I think he's capable of it.
But he needs to whip his goddamn nuts out. He does not have the time to fart around, business as usual, and try to develop and protect his staff. He needs to wipe the slate, nail the replacement hires after wiping that slate, and not accept embarrassing defeats. There is no time for "we'll get back to work." This is a state of emergency that requires autocracy, and he needs to brutalize this organization as it exists currently.
He's responded to staleness before. 2017 fell apart, and he fired basically the entire damn staff. In 2018, we rallied behind an identity and it worked, despite vastly inferior talent to what this roster has now. If we can do that again, with the head start we have after a few solid drafts in a row and some budding stars, then yes. He can win another championship. Not for sure, but there'd be a real shot in that case.
So my answer is that, sure. It can happen. But he's gotta do some generally out-of-character stuff.