He's on a 1-year contract, so if you want to say that Minnesota is "hanging their hat" on him, that's certainly a . . . take.
The plan all along was that Darnold would start in '24 and mentor McCarthy for a season, with the kid taking over the reins in '25. Darnold is basically a one-year rental. The hope was that Darnold would at least be solid and that he would have a better chance of succeeding in a system that offered him a great offensive mind as a head coach, major weapons at his disposal (Jefferson, Addison, Hockenson, Jones, etc.), and a decent O-line than he had in the the dumpster fires he found himself in during the first two stops of his career (NYJ and Carolina). So far that "decision" seems to be working pretty well. It's certainly possible that things might go south later this season. If that happens, the Vikings simply cut the cord and let him walk in free agency next offseason.