To be honest, as a person who's lost somebody close.. I don't think the difference between 2 days to 3 days in between a horrible incident is going to make a lot of time on coping. It's not like a funeral is going to cause closure, or that more details aren't going to emerge during the process that is just going to reopen the wound to cause more questions. Death is a horrible thing to deal with, but I don't see what delaying the game is going to accomplish, but cause more inconvenience for the players, the fans who are there, or the coaches. Some good ol' fashion football might be the best medicine for all people involved.
If what the reports are saying about this happening in front of Crennel, Pioli, and a few assistants (and possibly players), I don't think a lifetime is going enough time to shake the images from their minds that they saw in Belcher's final moments. It is very likely that it will be with all those who witnessed them for the rest of their lifetimes. Not as if having one more day is going to fix that.