User blog comment:B214/Question & Answers 5/@comment-72.220.143.12-20151012043030/@comment-24866657-20151014121224

@B214

That's my point, the time for Issei and co to be the protagonists is over and their children will be the focus, thus now they will have tons of works to do and likely will become the background characters who provide support on higher power level, politic or negotiation.

That's a happy ending (except for Asia but she will be saved so the point of being cursed is cheapened every time someone got cursed because you know exactly that specific character will be alright after everything).