While I like my K-5 (and all bodies before that) I honestly believe that mirrorless is the way to go, especially when done right. In theory, a mirrorless K-mount camera could be easier to produce and deliver better results because there will be a lot less variables for the AF system (Phase detect AF is a proven, but old system). I would not mind my K-5 having no mirror at all, if the AF speed is equal to or better than the K-5, and the LCD viewfinder is fast enough to cope with fast subjects. I've said it before: who would have objections against a system with a true WYSIWYG viewfinder? (And no, a camera with a ground glass screen is definitely not WYSIWYG).
Come on Ricoh, give us our K-mount mirrorless and grow into a market leader again!