Like you, I think we will have a question mark at 2nd base with Pedroia on the payroll but far from certain to be on the roster. I see us looking for a younger player who can be our 2nd baseman of the future. There may also be a need at 3rd base. The problem of moving Devers to first next year is that we also have Moreland signed and we don't need two left handed first baseman on the same team. Presumably, after minor knee surgery Moreland will be good to go for another season. We probably will keep Devers at 3rd for another season and hope that he shows significant impprovement in his fielding, his hitting and also his physical conditioning. After that he may find himself at 1st.
I think Pom is gone next season. Panda's salary is off the books after that and one major burden is off the books.