Smalltalk is a tool for the creative spirit. It's a very powerful tool for those who have something inside and want to develop it. On the other hand, nowadays, the alternatives that are massively propagated have other characteristics. They are for those who feel better (or calmer) absorbing what someone else has done. They are for those who hide behind the phrase "it is better to ride on the shoulders of others" trying to show wisdom, but in reality revealing dependency and unproductivity.
The problem with Smalltalk is that in computing, the "creative spirit" is a dying breed. Smalltalk is for the creative. Most think that creating is expensive and settle for copying (imitating) or using (claiming to re-use!).
Whoever thinks someone has something to contribute, let him use a Smalltalk, whoever doesn't, let him buy the latest.