I agree, but make a distinction between thinking it's bad that too few people are posting on LessWrong while many are posting in a billion other places instead versus thinking that there should not be multiple groups of rationalists.
I am all for multiple groups of rationalists. What I am not for is this community scattering across 100 different blogs.
Ever since Eliezer, Yvain, and myself stopped posting regularly, LW's front page has mostly been populated by meta posts. (The Discussion section is still abuzz with interesting content, though, including original research.)
Luckily, many LWers are posting potentially front-page-worthy content to their own blogs.
Below are some recent-ish highlights outside Less Wrong, for your reading enjoyment. I've added an * to my personal favorites.
Overcoming Bias (Robin Hanson, Rob Wiblin, Katja Grace, Carl Shulman)