We've grown FAR beyond the need to reproduce and conquer, we're reproducing like parasites now and we have evolved beyond the level required to decide not to live like this.
Though to make it more difficult we live in a society that only really "works" based on continual growth which really can only happen with a continually expanding population. One of the main reasons this is starting to fail is in the past, another 1000 people would need the same number of jobs in making food, farming, car production and the list goes on and on. Technology is at the point where the same population NEEDS less people working as it takes less people to produce the same amount of anything, so we have less "real" jobs and more pointless made up rubbish time wasting "busy work".
ANyway that aside, its ridiculous to suggest, for anyone that a kid is the best thing there is, it can be FOR THAT INDIVIDUAL, but if you can't recognise that everyone is no where near the same and for every good parent who loves their child there are both people who love their children, can't provide for them, live in horrendous decisions and have more kids, and people who hate their children and hit/abuse/moleste them.
Absolutely, unquestionably, not everyone should have a child, almost certainly most people shouldn't have enough children to grow a population that is out of control. Everyone who really wants one should think long and hard about providing for, and really being a parent rather than half the people around who do it without the brains, not situation to be the parent they should be to their child.
If you don't want kids, at all, don't have them. If the wife does desperately, you should seriously consider not being together. A bad dad, or a dad that resents their child is worse than no dad at all.