Reasons not to have Khan show up in Star Trek XII

Good reasons, all. [Link]

"keep Khan out of Star Trek 2 (or 12, rather)" blog post for a while now — but honestly I thought Orci and Kurtzman were just kidding about including him. The script for the next Trek, at this point, consists of a few Gorn cartoons on a cocktail napkin, and they're barely batting ideas around. So it's easy for them to hint at all sorts of fan-favorite stuff: Sure, maybe the sequel will include the Doomsday Machine and V'Ger blasting each other. Why not? Anything's possible at this point, and it doesn't do any harm to answer "maybe" to every question. And of course, if the fans get particularly thrilled about one of these trial balloons, then that tells them something.

But now, it sounds as though the Fringe co-creators may actually be considering resurrecting Khan, who's still sleeping in his little suspended-animation capsule in their revamped timeline. So just in case they're really serious about this, here's a list of reasons why a new Khan would be a terrible, epically bad idea:

We have 79 episodes from TOS to have as inspiration and starting point. We don't need to copy the movies, even the best one.

Here are some directions they could go instead of Khan.

Military threats:

• Klingons - The whole cold war tensions and Organians enforcing the peace neither side wants
• Romulans - Let them lie fallow for a while
• Gorn - Militarist lizards who can choke Kirk
• Tholians - Cool ships
• First Federation - Stunt casting: Clint Howard
• Mirror Universe - This may be overused as well
• Andromedans - Maybe we meet them coming to this galaxy, not trying to go home
• Federation - The Ultimate Computer, Mind controlled Federation officers, etc.

Monster of the week:

• The Man Trap - Shape changing salt monster
• Super Minds - Charlie X, Gary Mitchell, Squire of Gothos, Talosians, Plato's Stepchildren, Who Mourns for Adonais?, Catspaw
• Destroying Planets - Doomsday Machine, Operation: Annihilate!, For the world is hollow and I have touched the sky
• Shore Leave Planet - it's all fun until someone gets stabbed
• The Enemy Within - Bad Kirk and Wishy Washy Kirk
• Devil in the Dark - I'm a doctor, not a bricklayer!
• Robots - What Are Little Girls Made Of, Nomad, Return to Tomorrow, Requiem for Methuselah

Interpersonal stories and Politics:

• The Naked Now
• Harry Mudd
• Dagger of the Mind - brainwashed Kirk
  
• Conscience of the King - Shakespeare always improves Star Trek
  
• Court Martial
• This Side of Paradise - I think I like annoyed Spock better than blissful Spock
  
• Amok Time - No Vulcan anymore
  
• Journey to Babel - Only Sarek now
  
• Wolf in the Fold - Redjack!
  
• Tribbles
• A Piece of the Action - Any of the Earth analogues may be too silly
  
• Elaan of Troyius - Kirk teaching manners to someone more annoying than him plus space battles
  
• The Cloud Minders - class war
  

They might be able to combine a few ideas and inspirations from these to build a good movie. We can only hope.

Oh, one more thing:

No Time Travel!

Really, NO TIME TRAVEL!