Personally I am of the opinion that everyone is entitled to their own life, and that the default assumption should be that they make conscious decisions in line with their own preferences.
Have a child? Great, but don't complain to me about early mornings and stress... you knew that before you had one. No child? Go for it! But don't complain to me about loneliness and lack of purpose.
I'm leaning towards the no child camp myself. I love my long morning, and complete lack of some little createurs (rightful) demand on my time. Yes, I won't have the pleasure of seeing that little creature grow up, and I might have a lonelier old age (but there's plenty of social settings I can inject myself into), but that's life. There's advantages and disadvantages to everything.
The trick is to find out which ones you like more.