Ben Johnson has no history of developing a young QB. He took a veteran QB who had previous success and built him back up. This offense relies a lot on Goff making presnap reads and throwing with timing and anticipation. Will that work with a young QB?
If they beat the Packers, they pretty much eliminate them from the division. Green Bay and Minnesota still play, so one of them will lose. A win against the Packers would be huge because it would help in conference tiebreakers and division tiebreakers.
If you are going to make wholesale changes, now would be the time, like Sheila did in 2020. You give yourself a headstart on your GM search and putting together candidates.
Alexander has a 90 PFF grade in the few snaps he's played this year. He played for the Saints when Glenn and Campbell were there, so he's familiar with the system.
I'm reminded of the Cowboys-49ers playoff game a couple years ago where the Cowboys ran a QB draw but it took too long and the clock ran out before they could spike it.