I don't know who it will be but I just hope they pick a good GM who will understand how to run things in Boston.
Pedro Martinez put it really well - you need a special feel for the game and the city itself to succeed there.
Article on Pedro's comments: https://www.cbsnews.com/boston/news/pedro-martinez-what-he-wants-from-next-red-sox-general-manager-foundation-charter-school-dominican-republic-dan-roche-red-sox/
"You need to have a conduct that applies to Boston. You need to be proud to say, 'I am a Celtic,' 'I am a Bruin,' 'I am a Patriot,' 'I am Red Sox,' '[i am a Revolution],' 'I am an Eagle, Boston College.' You need to have pride when you come to Boston, like you are embracing Boston and giving max effort," said the 2004 World Series champ. "If not, then you are not probably well-suited for Boston. If you don't feel like Boston feels, then there is no connection."