I think he could 100%. If he had a genuine redemption arc people would reward him for it. BUT:
1. He has to stop coping and take accountability. He has to come out and just say "I fucked up, I know I fucked up," with no qualifications or deflections. Nick seems temperamentally incapable of this.
2. Even if he could do this, step two is he has to say "I'm getting off the Internet for a while to fix my life." And then actually disappear off the Internet for like, six months minimum. A year plus would probably be better.
AND THEN eventually, he could come back, and if he has done everything right, and somehow he is still with Kayla, and they have custody of the kids back, IF he went back to doing actual law content and was sober, I think he could have his redemption arc.
So while it's possible in theory, there are just too many hurdles to pass for it to ever really happen, IMO. Nick seems unable to log off the Internet so I think what we are in for is the best case scenario in terms of content: More coping, drama and fuck ups unless/until Nick eventually ends up in jail. He's going to continue his reign as king lolcow.