Lykul: I could think of a few options:
1) They want to remaster them like they did with Starcraft
2) Simple lack of resources/interest at Blizzard versus their own projections of sales even for a simple re-package and release of the original game
3) They want to recreate and rebrand the Warcraft RTS entirely to make it consistent with WoW lore . . . and then break that lore not even a week later
1) That would make Blizzard millions of dollars, no questions asked
2) That's how you rip your winning lottery ticket.
3) NO! Blizzard already said if there ever is WC4 it will continue with whatever WoW leaves off