Interesting dilemma. One of the Boston teams HAD to relocate between 1952 and 1961 with new markets ready for franchises and Boston's inability to support two teams. The Red Sox were the dominant franchise economically in Boston for years. The only time the Braves outdrew the Sox was in the early 1930's, when the Sox stunk and Fenway was desperately in need of upgrade. When Yawkey bought the Sox, rebuilt Fenway and brought in top talent, the Sox blew past the Braves and never looked back. Query what would have happened in Yawkey had bought the Braves instead.Originally Posted by 538280
However, the Braves had some great talent in the pipeline when they left Boston. Not only Spahn, Mathews and Aaron, but most of the major stars of Milwaukee were already on the team or in the system. The Sox would have been quite vulnerable if the Braves hung around as Yawkey lost interest in the Sox during the 50's. Ted Williams was the only thing keeping fans in the stands in Boston in the mid-late 50's. I could actually imagine Yawkey teaming with the Athletics or Senators to move to LA and SF before the Dodgers and Giants got the idea. Consider the "Los Angeles Red Sox".
What happens to Fenway if the Sox move? It would probably have been torn down or sold to BU like Brave's Field was. If so, by 1970 at the latest, Boston would probably have gotten a multipurpose stadium for the Braves and Patriots that would have been replaced in the 1990's by a nice retro ballpark. It's also possible that the Braves could have moved to Fenway, but unlikely because of Fenway's size. With extra revenue, Brave's Field could have been significantly remodeled, or its site used for an entirely new stadium.
The most intriguing thing about this alternative universe is the potential impact of Boston's baseball economics freed from Yawkey's racism and the Yankees' shadow. In the NL, Boston might have been dominant beyond what either the Sox or Braves have accomplished. Of course, you would still need good management, and there's never a guaranty of that.