I thought the theatrical cut of DD was ok, but the DC is great. Both versions, however, make Matt look like a bad lawyer when he threatens Quesada in front of the judge and jury, plus when his story differs from his clients he seems to just say "darn, well that didn't work." Also, he shouldn't have let Quesada die, his death should have been an accident. Ben was good in the role, and I would enjoy him if he came back, but I think we are done with Elektra. We have seen her story, now lets move on.
I would prefer to see a sequel as opposed to a reboot. I think they could go many different directions with the next sequel.
1- There is a scramble by several crime bosses to become the next Kingpin, with DD stuck in the middle. I would have Fisk take back his title at the end if this was done.
2- Fisk gets out of prison, and knowing Matt's secret, decides to ruin his life (Born Again). This would also work as a sequel to idea #1.
3- This is one I thought up a few days ago. Start it with a seemingly cameo appearance by Mysterio. Then, when the story gets started, we have a movie based on Guardian Devil. At the end of the movie, Mysterio is revealed to be the mastermind behind the plot that was intended to drive Matt to insanity. We learn he shared a prison cell with Fisk, and Fisk told him everything, since he found his plan interesting. Pretty much Guardian Devil from there.
I would be fine with either plot for the next one.