I've seen several people say that and it just reveals how little they actually know about Jared Goff in college.
As a Freshman at Cal, he got pummeled and his team had a terrible year, but HE did not individually have a bad season. For a Freshman starting on a terrible team, he actually did pretty well individually. He set several Cal single season passing records as a Freshman.
Of course he's going to progress with the Rams. It would be difficult to actually regress from this point. But the question is, how far? As a Freshman at Cal, it was pretty clear he had a nice college future ahead of him. As a rookie with the Rams, that's much more difficult to say.