[The] key question in my mind is not when such things converge in the laboratory, but when will such things converge in the mainstream?
I know it's a relatively small market, but Lisp and Smalltalk have been out of the lab for years. IBM's direction before Sun's introduction of Java was clearly aimed at Smalltalk and they were having a good deal of success with it.
There is no doubt that the Smalltalk refactoring browser was first. (Reading Martin Fowler's book will back the claim.)
But when the RB came out, it was aimed at, used, and ultimately made the de facto choice for commercial Smalltalk development.