Who’s going to be around at You’ve Been Left Behind to conduct ISP relations? Maybe the group should employ a staff of the damned to make sure things go smoothly after all those who are saved disappear. Some Unitarians would probably be up for the job—they’re such an amenable bunch, after all.
Otherwise, imagine Satan standing at the gates of hell laughing manically and telling a seemingly endless procession of new souls: “You should have checked your spam folders! MUWAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!”