Seeing how Hill has one or two years left in his career, and his wife can potentially sing for as long as she has her voice, I don't think it makes a lot of sense for them to choose NY over Boston. One wonders why, if NYC is so important, the Hills haven't made an off-season home in NYC over the years.
That being said, it's a private decision. People make career choices based upon a number of motivations, and I'll respect Hill's.