As a Trek fan, I wouldn't have a problem with the Cardassians at all, but the whole philosophy behind these new movies is to make them appeal to as wider audience as possible and rejuvenate the franchise, so I'd be very surprised if the Klingons don't feature heavily in the next instalment. I'd wager that there's literally millions of people on this planet who have never seen a second of Trek in any iteration that know who the Klingons are.
I'm not saying I'm desperate for a Klingon story (though a nice juicy fleet battle with a few D7 battlecruisers appeals) but, like they used Khan (and I would say the Klingons are far more famous worldwide) in STID, I think Bad Robot would be foolish to not use our ridge-headed friends in a major capacity in ST3, it's just a question of what the story will entail and wether they can write some decent Klingon characters for it.
I'm not saying I'm desperate for a Klingon story (though a nice juicy fleet battle with a few D7 battlecruisers appeals) but, like they used Khan (and I would say the Klingons are far more famous worldwide) in STID, I think Bad Robot would be foolish to not use our ridge-headed friends in a major capacity in ST3, it's just a question of what the story will entail and wether they can write some decent Klingon characters for it.