That "pool" of people "able" to "write" "extensions" is exactly the people you don't want touching your text editor, or any software for that matter. Anyone that has a psychological barrier to take a look at a language that they are not familiar with, let alone a framework or an ecosystem, is not someone that I want being anywhere near the software I use. In an ideal world, I wouldn't want them to be anywhere near the web I visit either, but that is a lost cause.