I'm going to be entertained watching the league trying to figure out if Darnold is the next Kirk Cousins or Jared Goff......PLUS to see if the Vikings pull a Falcons with McCarthy.
What they are going to do is obvious and shouldn't/won't be controversial at all.
You ride it out with Darnold as long as you can even if it means McCarthy remaining on the bench for longer. Give him a Geno/Baker type deal that they can move on from a couple of years down the line if he regresses considerably.
No need to rush to trot McCarthy out there. No way in hell should they let Darnold leave the building.