Noise is a valid complaint but where these planes will really shine is oceanic flights, USA to Japan, Australia, Singapore are 3 routes mostly over ocean or uninhabited areas that could use the reduced travel time.
NASA is working on designs to significantly reduce noise from breaking the sound barrier, which I'm sure will inform changing requirements for supersonic flight over the United States. Right now the regulation is a very strict "you cannot fly supersonic over the US", except military aircraft of course
I doubt it, outside of very small portions of the country. IIRC, the plan was to have huge airports in places like florida that the 2707 would land at and people would get on subsonic jets to connect to where they wanted to go. Unless sentiment changed due to people hearing how quiet a "sonic boom" actually is when one of them was cruising.
Most of eurpoe also banned overland supersonic flights.
