Upon his promotion to offensive coordinator for the Washington Redskins, Sean McVay turned the offense into the 10th ranked offense overall in the NFL from the previous year's rank of 25th. The Los Angeles Rams are currently in a very similar boat, with their offensive line being ranked 26th entering the 11th week of the 2016 season.
Yes, Sean McVay will likely be able to turn around the Rams' offense. He is a talented football coach and has already shown some impressive strategy skills, even with his young age and lack of coaching experience. He seems to be very in tune with the game and with the athletes out on the field. He will do well.
Sean McVay is one of the youngest NFL coaches in history. He has gotten to this place because he has talent. He will be able to apply those talents to turn around the Rams offense. McVay wouldn't be in the position that he's in if he didn't have the ability to get the job done.
There are too many factors in evaluating the Ram's offense to say that Sean McVay will provide a deciding turn around for the team. While his coaching may bring in fresh ideas, the team has to figure out how to get the ball down the field and convert in the red zone. The reality is the team may need personnel changes within the players.