What I thought was even worse than Claire Danes' character was the fact that the T-850 stated that Kate would be important to the resistance and eventually their "children" would play a major role too.
Excuse me, but when there's a war going on and you've got killer cyborgs after you, who has got time for nookie, let alone giving birth to children??? A man in John's position has no time to side track himself from the Human Resistance battle plans:
John Conner: "Terribly sorry chaps but the wife is wearing that special lingerie again tonight. Can we continue this meeting about how we're going to attack SkyNet tomorrow?"
The Terminator in T3 said Kate Brewster was important and eventually Conners' kids would be important to the resistance. Yet in T1 and T2 we're led to believe that it's John, and only John, who is/can be our saviour.
This is one of the plotholes that will have to be covered in the fourth film, which is why I think they shouldn't bother making one.