Lament for Ghost

I was reading a really old gaming mag on the john one morning, and I started to think about what the heck happened to Starcraft: Ghost? A Tomb-Raider-esque forray into the world of Starcraft, playing as a smokin' hot Ghost unit would seem simple enough. Hell a glance at the Tomb Raider series proves that just running around environments fulfilling objectives and killing enemies has been done with quite some ease.
Ah, but with Starcraft 2 out there on the Release Date horizon, I think attention will be shifted elsewhere, and Ghost will simply be one of those "What could have beens".