Does the Future Belong to Javascript?

I've been saying for a couple of years now that Javascript has a good chance of displacing Perl, Python, Ruby, and other scripting languages over the next two or three years: it has all their advantages, plus developers have to learn it to write modern applications. Apple's announcement that third-party development for the iPhone will be Web 2.0-ish --- i.e., HTML and Javascript on the client side --- is just another nudge in this direction. Kids, if you want to be on the leading edge in 2010, there are worse bets to make than becoming a Javascript guru now.