He is definitely trending in the bust direction, tough break for the Vikes if he is with all the eggs they have in that basket. I am not sure what their next move is if he isn't the guy, Rodgers will be FA but will likely return to Steelers if he wants to play, they dumped Cousins already. So, they will be left finding another retread to resurrect or taking another QB in draft.
At least McCarthy has an arm, Ponder didn't have anything to fall back on. He is still a worse pick at this point.