What i would like to happen:
Kylo Ren convinces Rey to come to his side. They band together to betray and kill Finn and Poe. The First Order completely obliterates the Resistance and they rule together with an iron fist!
The only survivors are BB-8, R2-D2 who escape, but are ultimately captured by Jawas to serve them until they rust up and are destroyed.
What will probably happen:
Kylo Ren remains semi-evil and emotional, and is defeated by Rey in a battle. Rey tries to convice Kylo to become "good", but he says it's too late for him, and somewhat apologises. Then dies.
Cue happy times, fireworks and maybe dancing ewoks.