Re: J.J. admits keeping Khan's identity a secret was a mistake
Likely because as good as STID did, it didn't do as well as many expected it to as a follow up. It did less domestically than the 2009 film, despite having a boost in 3D and IMAX tickets. The fact that Abrams himself regards the marketing strategy in hiding Khan as mistake should tell you something. STID was not a failure, but it's box office run isn't as impressive as other successful franchises and might not be enough for Paramount to want to put out so much money. That's also why there's talks of budgets being lower for the follow up film, because they realize it's not going to make the kind of profit that other franchises like PIRATES, TRANSFORMERS, THE DARK KNIGHT, MARVEL, ect makes.
I think people are missing something: there could simply be a "high end" that Trek movies can be realistically expected to make. That Star Trek will never have the same market appeal as super-hero and fantasy movies.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"