One thing which IMO could be done much quicker: adapt the armada timeline ships for a series of mini campaigns just prior to WC3 (saga already uses the lex).
how cool would it be to fly the wraith and battle jratheks...
also, I would certainly see the creation of the "end run" storyline... With kevin's landreich campaign covering false colors and standoff covering fleet actions, that would certainly be of interest.
you mention the movien ships, I suppose that might come in handy too one day, who knows... Personnally I would love to see a pre WC1 campaign centering around the mcauliffe and enyo attacks, possibly up to custer's carnival... heck from the way we see it, even arena ships might be of better use in that MOD than in the game (which is IMO barely worthy of the WC name).
even the privateer 3 script might one day be of use... Who knows!