Why would anyone want to have kids today? Most couples in the western world can barely support themselves while getting into home ownership, let alone trying to support multiple kids and put them through college while saving for retirement. The amount of capacity left in life for good child rearing is minimal. Add to that the fact that it's looking increasingly unlikely that there'll be jobs for their children anyway…
Add to that our increasingly lonely lives and fraying communities mean much less of a support network. Parenting is also exhausting now that “go outside and play, come back for dinner” is impractical (for various reasons good or bad).
why is this impractical?
EDIT: I'm getting downvoted but I am seriously not sure. I don't have kids right now but its part of how I intend to raise them when I get them.