But that's the point of Orbital Strike... You're dealing usually with the Inquisition, and the Inquisition can requisition ships from space, and command them to fire to the ground. The fact that the shots have to focus on a terrain piece and can't follow important targets should tell you GW staffers were thinking about how broken
that would be.
If GW were releasing fifth edition while they're still raking in the dough and still have armies to update, I might just use the money I was going to put into GW minis to buy an orbital bombardment from NASA.
But in all seriousness, I might just boycot GW while I sulk, and invite others to join my sulkage while I play Dungeons and Dragons 3.5 ed. to spite the wargame industry
and the new release of D&D 4th Ed.