@tsarstepan,
My theory is that Neil Diamond...who was born and mostly raised in Brooklyn, New York, found a way to make extra money off the song by reminding people that he wrote the song for Caroline Kennedy and how the Kennedy family has a long time history with the Commonwealth of Massachusetts. Since there's just one Major League baseball team in the Commonwealth and it's in Boston, he sold them on that.
In this time of healing for David 'Big Papi ' Ortiz, perhaps Diamond will pen a new song in his honor and to help him to a rapid recovery.