After a year of settlers and wastelanders coming back, you'd think they'd retake an old town.
Make an actual HUB that isn't Foundation down south near the dangerous Cranberry Bog.
I personally vote for Flatwoods to be reconstituted and reformed. A lot of abandoned houses, plots of land to grow crops, a reliable source of water. Wild and friendly Brahmin, and a working Responders Protectron.
It would also be an amazing way for new players to experience their first major town. Luke how we first entered Megaton in Fallout 3 or Diamond City in Fallout 4.