New York Times Reaches Online Milestone, but Many Challenges Await

LAST spring, Mark Thompson, chief executive of The New York Times Company, said The Times would soon boast of one million digital-only subscribers. Early this month, his prediction came to pass.   It is a major milestone, something no other news organization can claim, and is legitimately a big deal. However, it in no way assures the future of The Times, which continues to deal with the erosion of its traditional revenue mainstay: print advertising.