Now that you think about it, yukkuri aren't bound by ideas related to karma or belief in life like in Buddhism or Christianity, so basically even if they commit suicide, technically there'd be no punishments or one-way express train to Hell waiting for them in the afterlife. And as far as I know, no rules of a yukkuri's community would cover acts of suicide (unlike yukkuri homicide), so even on the living yukkuris' side the dead wouldn't be blamed.
This preset leads to the question: if they're not bound by anything, why wouldn't yukkuri commit mass suicide to go to that easy place all together? Their concept of heaven doesn't differ much from ours, aside from the fact that those that took their own lives can still go there (I guess?), so why don't they simply decide to abandon this world full of abuse and bloodthirsty (pastethirsty?) anons like you and I to go to a better place en-masse?
*p/s: for a requiem, this sounds damn bright and cheerful. Takumi's signature sparkle on a yukkuri doesn't help either.