Java was successful not because of its object system but because it was C-like and free of charge at a time when Smalltalk was very expensive. C++ is a mess, I doubt its SIMULA inspired object system had anything to do with its success. Python was only the sane alternative to Perl.
Ruby and Objective-C are the closest to Smalltalk and are very successful because of that.
I don't understand how you can extrapolate that to say that Smalltalk's object system failed. Even more so when the OP's idea of ruling the world is not limited to how successful a language is due to its object system, but how influential it has been the last 30+ years.
We are still catching up with the past.
P. S. By the way, Java was so slow at the beginning that Sun Microsystems acquired Strongtalk (a statically typed Smalltalk) and the result of that was the HotSpot VM.