Your hypothtical backstory is missing.
Vidlak is here because Abbott, Huot, et.al, aren't ready to take the reins. At this point, no one has any idea if they ever will be. Even if they were, minus Brown, (still on the roster) they're awfully young at the position. If the injury bug bites, or because, ineffective, or both, you're down to the third string guy - where have you seen that movie before?
Vidlak didn't come to compete, he's already been anointed as the guy. Just like Johnson and Sneed before him. So if you use this for the backstory, the answer to your question is yes, you do your best to find a backup. Perhaps a tall order given someone with those skills might actually expect a shot a playing. I'm not sure it's prudent to assume you can find another Cam Humphrey, a guy willing to wait his turn. Maybe, maybe not. How do you think Vidlak would have reacted if you'd have sprung Johnson on him in a week or two?
Rolling the dice on the season just like was done this past one, based on what's on the roster, will likely get you what you already got.
My question to you. How do you find an effective offense, something that can consistently get yards on the ground, ala NDSU, SDSU, Bozeman?