Yes, I do think that if the Rams lose to the Giants there is a good chance that Goff will be inserted.
On the other hand, what if the Rams score 31 and lose 35 to 31? And Keenum has a good game but our defense loses it for us?

And of course if the Rams win, I don't see how you bench Keenum. And Fisher wouldn't. He's too much of a "player's coach" to do something like that.