Why should they not?
Oh yeah i got this from blizzie's site
Whatever happened to StarCraft: Ghost?
No final determinations have been made yet regarding our plans for StarCraft: Ghost. The game remains on indefinite hold, and any future plans we have for StarCraft: Ghost or any other console games will be announced at a later date.
What happened to Warcraft Adventures?
Following an intensive and very serious review of the game, Blizzard decided to stop development on Warcraft Adventures. We determined that, given the game's status and the rapidly changing technology of the industry, it would not be possible to complete development of the title within a reasonable time frame.
While this was an extremely difficult decision, we firmly believe that we cannot release a game that does not meet the exceptionally high standards that both our customers, and we, expect from the Blizzard label.
Stopping development on this game was not a decision that was taken lightly. It was a hard call to make, but each of us knows that it was the right choice. We hope that Warcraft fans will consider our track record and trust our judgment on ending the project.
Will you be making StarCraft II?
We have not announced any current plans for StarCraft II. We are all very close to the worlds and characters we created in the original game and the expansion set and while we do intend to revisit that universe, we have no plans to do so at this time.
Do you have any plans for more Expansions to StarCraft?
No.