I'm sorry if this offends anyone but I think the threats of home schooling in light of Sandy Hook are kind of silly. Tragedy can occur ANYWHERE (movie theatre shooting, anyone?). Unless you build a bunker and live underground, you're never fully safe. I can't tell you how many status messages popped up on my news feed about home schooling. Some of these parents didn't even graduate high school. I don't think it takes a rhodes scholar to teach a child but it does take someone with a basic high school education.
Anyway, to answer your question, no, the recent events haven't made me think differently about starting a family. We're still a few years away but that timeline hasn't changed. When we have a kid, we'll do our best to make the best decisions and keep him/her safe but we can't live in a bubble. Life is about risks and you have to take them. If you don't allow your kids to experience the outside world, you're doing them disservice and in my opinion, you may as well not even bother having them.