Heck, even Self, which nobody ever used for actual shipping software (as far as I know), still has some life in it. The latest release was last year and runs on Linux, Mac OS X. (What, no Solaris support?) http://blog.selflanguage.org/2014/01/12/self-mallard-4-5-0-r...
Compared to Self, Smalltalk and Scheme are downright mainstream, and used in all sorts of production software.
This is important if you're planning on inventing a new programming language. The chances that you create the next Javascript or Java are slim to none. Those languages are platforms that are backed by large companies. Languages invented by enthusiastic geeks can succeed, but they don't take over the world. Even when success does come, it's after decades as niche languages with tiny communities.
If you consider Smalltalk and Scheme dead, be prepared to have your language be stillborn.