Incrementalism.
Bawstin has sumthin like 300 institutions of highah education in a 10 mile radius and every August, all the kids on the planet arrive to go to school, get drunk, laid and develop a love f'the place.
YOU all sent yuh(r) dawtahs heh(r) to be educated and we made babies with 'em.
Theh(r) ah many reasons for the decline of the Bawstin accent, mosltly though it's wat'id down because of inter marryin'
Southie UST'A be the last haven f'the accent, but I've bin gone since the '70s.
Now that I think about it, I can’t recall the last time I heard an enemediot newsreader anywhere with any kind of regional accent. The enemedia must be biased. Go figure.