EvilCoop is now weaker than before, after both having been shot and losing BOB.
GoodCoop certainly needs to regain his consciousness, then cue: GoodCoop vs. EvilCoop - The Ultimate Showdown .
I think it's exactly what won't happen. I think they are going to merge, and what would be more good than a fight between them is DoppelCoop willingly merging with OriginalCoop. I mean I hope we won't have a spectacular fight ala Matrix i.e Neo vs Smith, it wouldn't be as rewarding as a DoppelCoop rendition to GoodCoop (again, just my opinion) What would be really beautiful and great is GoodCoop extending a hand to his Doppelganger, embracing his shadow, as he was supposed to do when he entered the Black Lodge 25 years ago, accepting him and them merging together. I always thought that the best way to perfection meant you have to know yourself and accept your dark side, your fault and fails. What better scene than Cooper literally embracing his doppelganger in order to integrate him and be really complete? I do think GoodCoop need DoppelCoop as much as DoppelCoop need GoodCoop.
Sorry for my atrocious english, I do my best but I'm still struggling with grammar.