Gerald R. McDermott
Will everyone one day be saved? Is hell only temporary, if it exists at all? If the answer is yes to either of these questions, the historic Christian commitment to the conversion of the world to Christ would appear to be somewhat silly. Why go to such effort and expense trying to persuade people that Jesus is the only way if they all will see that eventually anyway? Why risk offending people—especially those who follow other religious traditions—with the presumption that their way is insufficient without knowledge of Jesus Christ if we will all one day enjoy the full truth in peace and joy?
http://thegospelcoalition.org/themelios/article/will_all_be_saved