We'll see several more games of a capable but limited Keenum (who I'm glad we kept, btw) and it'll grow more obvious by the game that we need someone with a bigger arm, elusiveness, quick release, accuracy downfield.... Even if Keenum does EVERYthing to the best of his ability, he can still be planned for by good teams. With each game of film it'll be harder for him to perform, because they things he does well just aren't enough. He's solid, but not dynamic and multi-faceted.
I voted 4 weeks, after the Rams go 1-3.
Then we'll see Goff have an encouraging but unspectacular season, which might be enough to get us to a winning record and WC berth, but I predicted 7-9 which would indicate a winning record for Goff.