New York’s coronavirus death toll topped 10,000 and the worldwide number of confirmed cases hovered around 2 million on Monday, even as the lack of fresh hot spots globally yielded a ray of optimism and fueled discussions about how some places might begin to reopen. The brunt of the disease has been felt most heavily in New York, Italy, France, Spain and the United Kingdom, but grim projections of a virus that would spread with equal ferocity to other corners of America and the world have not yet materialized after more than a month of measures meant to blunt its impact.