I liked Cumberbatch as well, and I have seen Wrath of Khan a few times. Khan is the best movie in the franchise without a doubt, but that's not saying much when most of the other movies are generally mediocre to downright unwatchable. I think the series might be dead in the water though, unless they can find a way to produce a cheaper movie. Star Trek just doesn't have the same fanbase as Star Wars, Marvel, DC, or even franchises like Hunger Games, Harry Potter, and Pirates.
Both new Star Trek movies were promoted heavily and had massive budgets. They also brought in one of the "hottest" actors at the moment to play the only villain in the Star Trek universe everyone generally knows. Sure people know who the Klingons and Borg are, but not enough to care about them. They obviously believed they needed to use Khan's name to do well at the box office, but even that didn't work.
Paramount and Abrams did all they could to make Star Trek a success imo, and yet Into Darkness made less domestically than the first one, and was only the 14th highest grossing movie of the year. The problem is that young people today just don't care about Star Trek. It's generally for an older crowd, who was there for the television series. It's pretty much a stagnated franchise at this point; I am sure there will be more movies eventually, but I foresee massive changes for the series.
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