Just remember that we're talking about a company that managed to migrate its entire product line to an entirely new processor with few people (inside and outside the company) really knowing until they unveiled the first demo machines.
Compared to that, adding a new programming language (that doesn't even affect their existing 3rd party applications) to a platform they own completely is child's play.
To be fair, NeXTStep very publicly run on x86 before NeXT was bought by Apple -- it didn't just appear out of nowhere. And the actual processor is mostly abstracted away -- it's not difficult to simply recompile your apps for another CPU.
I think we're talking past each other. All of your comments seem to be arguing that Apple could do this if it wanted to, while all of my posts are arguing that Apple hasn't shown any desire to do this.
AndrewO's comments seem to be arguing that Apple has made even more drastic changes in the past without publicly showing any desire to make the change until shortly before doing so.
Compared to that, adding a new programming language (that doesn't even affect their existing 3rd party applications) to a platform they own completely is child's play.