While I doubt that Apple will phase out FW on it's 'pro' machines, the funny thing is that the 'consumer' machines need as much, if not more, storage bandwidth than the hi-end machines when it comes to dealing w/consumer cameras because iMovie and FCE can't edit any HD format natively. They transcode AVCHD and HDV into AIC for editing and while AIC is easier on the CPU it balloons the file sizes up to nearly 50gigs/hr (native HDV is around 13 gigs/hr). So someone using iMovie and a consumer HD camera has the same, or greater, storage needs than someone using FCP and a consumer HD camera.That's what I love about Macrumors forums. Reasoned debate conducted on reasonable terms.
While I see your point, DH, and sympathise, don't you think it's exceedingly unlikely that Apple would abandon FW support on higher-specced machines than the Macbook, for just the reason that you cite, namely "that [no one] with a substantial investment in Firewire equipped gear would consider purchasing a Mac"?
There were rumours abut SJ's health doing the rounds, but none of them mentioned a decline in mental health . . .
EDIT: I wrote that ^^ before I read this >> https://www.macrumors.com/2008/10/17/steve-jobs-on-lack-of-firewire-in-macbooks/
What the . . . ?
Lethal