I'm not sure personally. Having him be redeemed would perhaps feel like repeating Vader's storyline, but then again, that would fit here seeing as Kylo wants to be Vader so much. Him being redeemed would put a nice thematic connection between Kylo and Vader. Kylo realizing the truth about Vader and how he had ultimately forsaken the dark side for family would be very interesting.Chris Mosher said:I wonder if people want to see him redeemed or remain on the dark side?
On the other hand, there would also be a significant and interesting plot with Kylo aspiring to be so much like Vader, but in the end finishing as a polar opposite of him by not being redeemed. Kylo trying so hard to be more like Vader and missing the point and the end of Vader's journey would be a compelling thing to watch. And it would also present something to the series.
I lean more to the redeeming option, if anything, then to not watch and think about Leia suffering so much for completely losing her entire family. And also because Kylo himself still seems conflicted about everything. This conflict was done really well in this movie and it would perhaps be a shame to remove it entirely from the character in the next two movies and finish this arc right now with "From now on, he's evil forever."