"Go's Rising popularity is false assumption. Comparing to popularity of only modern languages..."#1. I'm not comparing popularity, but the trend in popularity. Of the three languages you're comparing against, only Go is showing an upward trend, which might be expected since it's so new. This novelty may explain why we're seeing so many Go articles hit the front page lately.
Many of the articles are the same: "We recently switched to Go, and here are our impressions." Nothing earth shattering, but people apparently are curious. Python and Rails aren't as new, and a good portion of the HN audience are probably already quite familiar with them. The threshold required to get clicks on a Rails article will be much higher.
#2. Your metrics are flawed. Notice all the news stories related to "python" and "ruby." None of the articles are actually about the Python or Ruby programming languages (though many are about Berlusconi's underage prostitute). If you look at Scala in isolation, you'll notice almost none of its news stories relate to Scala the language either. They're about La Scala the Italian opera house, or scala the italian word, etc. GoLang only refers to Go the programming language.
Perhaps it makes more sense to view it in the context of other unique programming names, as compared here with Erlang and Node.js (http://www.google.com/trends/explore?q=golang#q=erlang%2C%20...). It looks like Go will surpass Erlang soon, but Node.js searches have been growing about 3x as fast as Go.
"practically, Go is still a niche language."
You're right, but that doesn't seem to stop it from generating a lot of traffic on HN. Which is what we're talking about, after all. And here we are, discussing it.
