You need to understand the history of Smalltalk. In the 1980s and early 1990s, Smalltalk did “catch on.” In fact, IBM chose Smalltalk as the centrepiece of their VisualAge enterprise initiative to replace COBOL. However, Java arrived on the scene in 1995 and eventually usurped that role. (Sun Microsystems had huge mindshare in those days.)
The major Smalltalk vendors of that era continue to live on today in different corporate entities: Cincom, Instantiations, GemTalk Systems. Look at all of these Smalltalk products to see how popular Smalltalk still is.
Is Smalltalk as popular as Java and Python? Hell, no! That’s the reason for my Smalltalk evangelism. But there’s no question that Smalltalk can stand toe to toe with the likes of Haskell, Clojure, Erlang, Common Lisp, and D. Smalltalk enjoys greater commercial adoption than any of these languages!