User blog comment:RoznosicielCiast/Least popular champions/@comment-5549414-20130125170908

In my opinion the reason that some champions get ignored by not only the player base, but also by Riot, is that they release new champions too much. Why would you go and play older champions when a new one is going to be release in a few weeks? If people really want to see a change in the meta, and see both newer and older champions be used to thier full potential, Riot would have to lay off the new champs and focus on what they have.

Imagine a fighting game where a character is released every 3 weeks or so. New technology or playstyles may never be discovered because players would constantly be trying to figure out these newer characters. Hell, Ultimate Marvel vs. Capcom 3 has been out for a little over a year now with the same content since release, and new combos, strategies, and even glitches are still being found out.

tl;dr

More content isn't always better. Let what you have sink in with the players, and fix those problems as they come.