FireWire did (and does) things differently and better than other buses. Mini-DVI does nothing that DVI doesn't already do.
I could grit my teeth and accept it if Apple were trying to turn it into an actual standard, but insofar as I'm aware, they're not.
I'm pretty sure that new port isn't a new form of DVI but rather more of a display bus. Then whether it's HDMI, DVI, Displayport they can all work with adapter(s).
At least, that'd be the smart way to do it.