So L went into oblivion?
It seems from what Ryuk said, L's soul would not go to heaven or hell when he died since he used the death note. That really sucks, after all the good he did he ended with the same fate as Light.
Yes, as a user of the Death Note, his soul could not go to heaven or hell; it's part of the tragedy of his character.
Nobody is entitled to an opinion. Everyone is entitled to an informed opinion.