I mean the game might come out in early 09 http://www.thetechlounge.com/news/13395/StarCraft-2-Out-1st-Quarter-Next-Year/, so a console release could be possible as a fall 09 release.
I mean xbox 360 has its fair share of RTS but with Halo Wars and Starcraft 2, RTS might just become a popular genre on consoles.
And with PC games falling due to piracy, I would think it could be a wise move for Blizzard.
If that would happened, I think it is a big win for the 360 because they need all the help they can in 09.