Hopefully not as I still do like the snappy old fart!
I don't think suicide is the answer, he seems to be spiralling into a mental breakdown and may well go down the Arthur Fowler route and maybe he could end up being sectioned!
As a fan it is really sad to watch and if he commits suicide then he can't come back and I know while most of this forum would welcome that, I wouldn't, I would rather him go away and get well again!
Maybe they could write him out that way and he doesn't have to die to never come back to the square, he could maybe get a couple of years in a mental hospital until he's in a more stable state of mind and Kat stays in the square but goes to see Alfie and talks about him and when he's released he doesn't come home because he's automatically collared by the police for arson and insurance fraud and ends up on remand and we do see him a bit as Kat goes to the trial and he's sent down for 3 or 5 years to prison and Kat tells him she'll wait for him and comes home alone, she still visits Alfie and mentions him from time to time and eventually he tells her to forget him and she later begins a new healthy relationship with a lovely guy who never lets her down and provides for her every need, well almost because a couple of years into the relationship she decides it's not working because nice as this guy is he isn't her 'man in the moon' so she ends the relationship and gets into contact with the prison and resumes seeing Alfie and when he is finally released for good behaviour he decides he can't come back to Walford because of all the bad memories and people he hurt and let down so he gets in touch with Spencer who sends him money to go and join him in Australia and Kat decides to go with him and off she goes in the back of a black cab!
I know i'm probably letting my imagination run riot but this way Alfie can stay alive which is what I want and get help for his mental health which he needs, go to prison which is what he deserves and never come back to our screens apart from the trial, which is what everyone else on this forum wants!