As much I would love to see a stronger embrace of the international styles here in the US, I also see great value in FK. American folkstyle is uniquely ours, and it originated from traditional English styles of wrestling that has long since disappeared in the UK. I certainly don't think we want to lose folkstyle as it is a part of our unique cultural heritage.
Twenty years ago when I would travel to various small and mid sized cities across the country, they used to look different. Each one had their own independent restaurants and shops, and character that made it unique. Now when I travel the towns all have the same fast food, same chain restaurants, same big box stores and they are essentially the same (insert Jackson Brown lyric). We have lost our local and regional identities to embody a national consumer class. If FK would ever go away we'd be giving up national heritage for a global uniformity. I know FK is in no real danger to disappear anytime soon, but I do think its important to keep in mind the cultural importance.
Baseball & Basketball started as solely American sports, and were ultimately exported around the world. Who's to say that we couldn't get folks in other countries, particularly those without strong wrestling traditions, to embrace American folkstyle.