They're banking on Purdy becoming another Brady or Kurt Warner. They have no resources to upgrade the position now. He came out of nowhere to lead them to a lot of wins. If defenses figure out the reason he wasn't picked drafted till the final pick in the draft, that Lance whiff is gonna rear its ugly head for them.
I get all the 49er games on the local station here. I've seen a lot of their games over the years. Purdy was more of a game manager than elite quarterback. That system rewards quarterbacks who don't force things. Throw short to Deebo, McCaffrey, Kittle, etc. Let them make plays. They might have the best roster in the league.
Its enough to win a lot of games. Some playoff games. Is it enough to win a Superbowl? Win a shootout with someone like Mahomes, Burrow or Allen? I really don't think so. That window is gonna be closing soon. And they will be looking at letting guys with big contracts go.
This year is their best shot. If you win a championship then have to tear it all down, its ok. You got what you set out to accomplish. If it doesn't happen I have to think everything they did would be considered a failure. And all you have to do is look back at the failure to address the most important position.