Earlier quoted context omitted.
As a very, very long time Mac user, the transition from 68k to PPC, then Mac OS 9 to OS X, then PPC to x86 was fairly smooth for the most part. Apple's relatively firm iron grip on their ecosystem due to their vertical integration gives them a lot of latitude to make moves like this be minimally disruptive to their user base. Now this is of course often annoying and disruptive to its developer base, and I've been on…
Apple has never pulled off a transition like this before. None of your examples involved going from a popular architecture with broad software support to a less-popular architecture. Transitioning to x86 brought additional customers who prefer Mac but also need to run Windows or Linux or who do x86 development. Transitioning away from it may lose them.
That's exactly what the 68K-to-PowerPC transition was: Going from a widely used architecture (Mac, Amiga, ST, and others) to a brand new one.