I don't know about redemption, but I can see Snoke rejecting Kylo and proving Han right, that Snoke really did only want him for his powers. As killing Han apparently weakened him, Snoke might set his sights on someone better suited for his use (either Benicio del Toro's rumored villain or Rey). Kylo maybe just manages to escape with his life, but I don't see him going back to his mother either. I suppose I see Kylo more like Gollum, he might seem redeemable for a bit, but ultimately isn't.
I considered Snoke rejecting Kylo, and Kylo realizing that Han was right, but if that happens, Kylo is still ultimately selfish because what made him turn from the dark side was his own safety. So I wouldn’t like it if they went that way.
But yeah, maybe Kylo won’t be redeemed but be a morally gray character instead.