Well Bengaluru is the city's ancient name, so we should call it like that, afterall if roads are ancient, name should also be ancient.
Jokes apart, i dont know what difference will it make, it will still remain the best city in the country. I feel Bangalore is a better name, and yeah, Bombay, Calcutta, Madras sound better than Kolkatta, Mumbai, and Chennai.
Politicians use such tactics to appease local people (votes rather), and our ppl fall for it, politicians maybe doing a pathetic job running the city, but just the fact they changed a city's name to sound it like regional language make ppl happy