the truth is that nobody can predict whether or not it's going to get better for any given person. life is pure randomness which we, in my opinion, have little control over all things considered. saying it's going to get better for certain, or the opposite, claiming it will only keep getting worse is all the same in the end, it's just a gamble and a random guess. statistically speaking, most people's lives alternate between being good and bad, sometimes with those streaks lasting longer or shorter, but then again, you'd have to ask yourself what kind of "good" would make it worthwhile to stick around, and what kind of "bad" would reinforce your decision to ctb.
on a somewhat related personal note, i kinda gave up on the idea of life getting better overall because no matter how my life improves, i would need to continue living with the brain and body i already have - and those two things can only get so much better as i age. i can't run away and change into a whole different person, which i desired my entire life, so no matter what happens - unless its an earthshattering miracle of some sort that i cant envision as of right now - there is no reason for me to count on "better times" when making a decision about suicide.