I just don’t see it. Vista didn’t send people to the Mac in droves and neither will 8, and 8’s a much better OS.
Vista was not remotely the crash and burn that 8 has been.
Vista didn’t change the user paradigm... 8 did, and in a horrifically bad way.
Also Vista was release in 07 when the juggernaught that would be the Mac Ecosystem for devices only contained a classic Ipod, as well as data interchangeability which is far more open than 7 years ago.
The barrier to changing OS’s is not what it was for the consumer.
Its a different world in 2014.