Glad I got in when a license was $15. If there's one feature I'd like in the future, it's extensibility. Let dev communities write their own plugins for languages, so it doesn't all fall on Granger's lap.
It's not just desirable; it's absolutely required. Look at every successful dev environment and you'll see a large community of developers making it better. Those that survive in spite of this (eg Xcode) do so because something else forces their continued existence (such as being the only way onto the iPhone).
