Possibly too spoilerific of a question to answer properly, but I'll give it a shot. I think it's been said previously that Asriel will eventually turn back into Flowey as a definite thing, but it's an /if/ on him being redeemed.
What does that mean with redemption, exactly? Is it more meant to say that the post-story Asriel/Flowey remains a bitter and villainous schemer who's burned every bridge both real and potential with just about the whole Underground? Or does it imply something darker - where Asriel's 'inverted fate' means that he's figuratively swapped out his respective fates from canon's TruePac and Geno, thus dooming himself to die for good?
I think you may be talking about some discourse a while back because I got some really aggressive anons who were acting like Flowey doesn't deserve redemption.
It would be against the spirit of Undertale if he got a downer fate. However, what IS left to be revealed is how other characters will react to his actions.
...That being said, Frisk was extremely hurt by Flowey and I don't plan to brush that aside.