I think so, yes. My impression is that Smalltalk fans lament the loss of the tooling around the language more than the language itself, so they're not as likely

I think so, yes. My impression is that Smalltalk fans lament the loss of the tooling around the language more than the language itself, so they're not as likely to focus on Objective-C's success -- but I suspect there's a case to be made that the underlying object and message-passing concepts Obj-C borrowed from Smalltalk enabled a lot of NextStep's rapid interface builder technology to be as good as it was in the 1990s, and that technology kept them alive long enough to be bought by Apple, rejuvenated the Mac, and laid the foundation for iOS.