Being the only "yes" so far, I'd say that we could not really say never, couldn't we? It all depends on the context and, of course, on the person itself.
This said, yes, it is a much more complex game when there are kids involved, and it is not something most people would desire at first.
Also consider the age factor: the older you are, the more probable is that your partners about the same age will have kids (or teens, or grown ups). If you're younger, most people will think it would not worth the risk by default, so it would be harder to discover the chemistry...
Not right now, no. I'm still in education, I don't have a job, I don't have time for a child in my life and I'm not responsible enough for one yet. I don't really have the ability to have a kid of my own, certainly not to get involved with someone else's.
That's a tough one. I married and divorced a women who had a kid once. it is the one big regret in my life. I loved that little kids, just as much as I loved her mom and my own kids. However, when her mom left me, I had no rights to the child, and she took her away from me. To this day, I miss her.
However, I cannot say that I wish I never meet this little girl. It would be like saying I wish I had never had kids.