Hm... depends on what he got back, how, and when... also what happened outside of the memories and what kind of support structure he had. Killing Lancia's family was not only a good way to take complete control of Lancia's life, but it completely cut his ties to anyone except Mukuro. It would be interesting to play him out getting his memories back. If he has a support structure then it will go better, and he'll be able to cope. If his support structure is weak, then it's likely to break him again, and he'd become highly suicidal.

Do you have any particular hopes for the upcoming arc?