I think they will absolutely be targeting better OL depth this spring. In both free agency and the draft. I think they realize they were fortunate to have all 5 OL start every game. They know a lot of turnover is happening on this OL in 2019 and the time to start preparing for that is now.
Beyond that, the key to offensive improvement is Goff and his further development. It was great to read he is going back to 3DQB this spring and that McVay has the urgency to keep working closely with him. Refining the strides he made a year ago and his mastery of the offense will go further to maintaining or improving the Rams offense than re-signing Watkins or pretty much any other personnel move they could make.
As McVay, Goff and their OL go so goes the Rams offense.