If Andy chose not to play Davis Cup then it wouldn't be necessarily fatal, as Serbia aren't likely to send their strongest players either -- and anyway we'd be assured of a place in the World Group next year already.
But enough of that. Congratulations Andy on a fine win. Much less nerve-wracking than previous ones, perhaps because Raonic couldn't quite find his best tennis but also because Murray was just that awesome. Wonderful to see him back as a Slam champion again!