He's a top offensive mind, sure. But he's also hungry to improve and learn and build a deeper knowledge of the game. He has surrounded himself with top coaches that keep him grounded and who are teaching him. And that's the thing about him IMO... He's not an egomaniac the way a lot of top NFL minds are. But he's every bit as competitive, and isn't ever going to sit back and think he's arrived.
So I don't see the Rams taking a step back just yet. Their roster has some questions, but all rosters do, and all the key pieces are in place to include a guy who will go down as one of the best head coaches of his generation running the show. They're already tuning Goff through the OTAs with a strategy of seasoning him with the things teams will copy from what slowed the offense late last season and in the Super Bowl. McVay is anticipating the league.
The dude is going to win us Super Bowls. Starting this year. IMO.