Hello,
Of course with Disney you never know, but this seems very impractical to me from an operations point of view. There would be significant downtime for any change to occur since Facilities would have to be involved and testing performed before control was turned back over to Cast Members. Cast Members would have be trained to be aware of operational and safety differences. Previously when Disney's done this sort of thing, it's always been for a scheduled, continuious period of time (Indiana Jones and the Tempil of Peril, Backwards! at Disneyland Paris, HMH and SWH at Disneyland), not within the same operating day.
From a purely business point of view, this expense for a nighttime Space Mountain "experience" doesn't make a whole lot of sense either. Space Mountain audience is largely local or AP teen audience who is probably going to ride it whether the "experience" is added or not. If the teen is local, they're not likely coming to Disneyland *just* for Space Mountain. If they're an AP'er, they'll ride it eventually regardless. For the out-of-towner, it seems unlikely Space Mountain will make or break anyone's vacation to Disneyland Resort.
I know there's been a lot of rumor about this and other attractions on the net, and like I said who knows, but it just seems hard to swallow this from an operations point of view.
