Consistency is all I'd ask from this team. I'd prefer a consistent 8-8 or 97 with the occasional 10-6 or 11-5 over a 4-12 followed by an 11-5 and an encore of 7-9. Not saying you gotta win the division every year, but at least be in the conversation beyond week 11.
Doug Williams won a Super Bowl (42-10 over the Broncos) and was the Super Bowl MVP. The following season he was a backup, was waived and never played another game in the NFL. So, yeah, I don't really give a fug what Rivera did 4 years ago. Players sure don't get that benefit of the doubt.
If Allen stinks it up again yes, we should see if our third round pick QB is better at protecting the football going forward. Being afraid of ruining a QB like Carr is just...cowardly if you are serious about evaluating what you have at the position.