If you can hire a new HC like Daboll, Moore, Brady, etc then yes you give up Lazor. I’m sure at least of of those three would like a HC opportunity and to work with Fields.
Here's the thing - yes, there is a risk of failing, especially with this ownership.
But you can't let fear lock you in to sticking with mediocrity or worse.
You want Fields to have an Aaron Rodgers-type run? A transcendent talent who only got one Superbowl because he was kneecapped by a shit coach whose system was stuck in the past and an indifferent front office?
Sorry, but I do NOT want to follow the Packers template for handling the franchise QB, and by sticking with Nagy/Lazor, that's exactly what we'd be condemning Fields to.