I'd love for Peterson to return, but I'd peg the chance at around 35%. This will be his first chance to get a good payday, and I think he goes for it. If Brewers can do something like 2 years @ $4M a year, it's a no brainer. If someone offers him 4 years @ $8M or more a year, he's gone.
The $3M option on Boxberger ought to be picked up. I'd give him a 85% shot of returning.
They're moving on from Narvaez. Severino or Feliciano will be on the roster. I'd put Narvaez's chance of returning at less than 5%.
Rogers will only be back on a short, cheap deal. If they can sign him for a year at $4M, sure. If it takes 3-4 years at $6M or more he's gone. 20% chance of returning.
And WONG? It's not complicated at all. He's gone. They can spend the $8M better elsewhere. Less than 10% chance of returning, and only if Peterson is gone.