His current misery is a reassuring sign that he will survive. Sudoku jokes aside, depression and suicide are delicate topics and there is established code of conduct in the media world with regards to dramatic portrayals. I'm not going to paste the whole thing but here's a few quotes from the Samaritans Media Guidelines:>Never show that a suicide or suicide attempt has been ‘rewarded’.>Be Aware: Men are much more likely than women to take their own lives; in particular men in mid-life from lower socio-economic backgrounds are at higher risk of suicide. A sensitive, responsible and realistic portrayal of suicidal behaviour of a working class male character could help address a serious public health issue, especially if the character sought help and chose to live.>Take extra care when portraying suicidal behaviour in young or sympathetic characters. These are the characters that vulnerable viewers are most likely to identify with. Remember that young people are the most likely group to be influenced by the media and therefore at high risk of ‘copycat’ behaviour.
Jack counts both as 'young' and 'mid-life' which is why /co/ is finding him so relatable. Jack dying, particularly by his own sword, would be incredibly irresponsible writing. From what we've seen so far, it's being handled delicately and realistically, so I don't think they'll pull that shit. I'm not being hyperbolic when I say that if they do a hopeful spin on this, this show will save lives.
On the other hand, there is one other way that it could still be handled responsibly, and that is if he died and failed. None of that bittersweet shit, a proper bad end. You will not achieve your goals, you will have wasted a life, your personal Bad Guys will not be as affected as you hope, and the world moves on (aka the reality of suicide). So he'll either live or we're getting the worst timeline possible.