Chumpboy, I should not concern yourself much.
Given the way things are trending, its likely Apple will become a trilogy: an R&D group, a software company and a hardware vendor for high quality computers (with Intel Inside) and peripherals (iPod, Apple Cinema, etc, and, hopefully, TouchStream). In the last category, it will probably make little difference what physical rig you have, just what software you are running, if even that.
In any case, the interface is already USB and I can't see any reason to change that, nor any alternative to change to other than perhaps FW which wouldn't seem to offer any advantage and even if it was changed to FW, there shouldn't be much problem adapting it to any physical rig nor even any common OS, including XP or the coming Vista.
Besides, to introdice a peripheral that couldn't switch hit would be foolish in indeed and Apple is not often given to foolishness.
Invent the Future