http://www.cracked.com/article_23980_5-parts-daily-life-that-your-kids-will-never-experience_p4.html
I'm actually fine with most of these. I've never been a fan of big-name high-production-value porn, and camgirls certainly have a more... I don't know, "intimate" feel to them. The only drawback I see is having to wonder if the video you're watching is entirely on the level, and working conditions for performers (STI checks, fair pay, ability to back out, etc.)
As for the circus, I do have a fond memory of seeing an elephant at the circus when I was three, but that memory is a little tainted now knowing that elephant was probably miserable and lonely. Big animals are big for a reason, they evolved in an environment where there was enough space to sustain them. Though I am a little sad at the prospect of kids not being able to see exotic animals up close. I mean, most of you have probably never seen a buffalo up close, and I can tell you, that knowing what a buffalo looks like and having a grasp on the size of one is completely different from being able to feel the kind of raw power they exude, just staring you in the face.
I'm also cool with parade balloons going away. With our ever dwindling supply of helium, we've got bigger problems than balloons.
Edit: I should probably point out that I'm a total hypocrite when it comes to animal welfare. Because I don't like circuses, and I'm kind of on the fence about zoos, but you will take my rodeos from my cold, dead hands.