Equalists in Legend of Korra; short-term villains?

I was looking for something else related to Legend of Korra while surfing through some Korra fansites, and I noticed this old bit of news from before the show premiered that some of you might have seen before, but was certainly news to me: Scroll to the bottom of the post where it talks about the “Future of the Series”.

First off, there’s no way they won’t net more seasons. This show is glorious and will be extremely popular… guaranteed. But if what they say is true, that means that Amon and the Equalists are temporary, and won’t be series-spanning like the Fire Nation was. My initial sadness at only having the Equalists for so long is counteracted by excitement for a constantly changing series. This could be very cool. It also explains why they’re going through the Equalist plotline at such a brisk pace; they’ve revealed things much quicker than they did with the Fire Nation.

Side note, on Avatar Wiki’s page for Amon, under Trivia, there is a crapload of creepy potential name origins for the guy. xD