Based on the discussion of expansion I was trying to think of two far points on property. I figured Animal Kingdom and Magic Kingdom were more or less edge to edge. Google maps shows ~6 miles if driving, but it's ~4 miles when drawing a straight line.
Obviously they won't do max speed, so for the sake of easy math, if they are going 60 mph (not including the wait time for a gondola, +1 minute for loading, +1 minute for unloading) the trip would be 8 minutes if they "follow" the road, or 6 minutes if they did a straight line.
I've never rode in a gondola system before, so I'm betting what I'm laying out isn't realistic, but from the perspective of someone who doesn't rent a car on his Disney trips, 10 minutes from Animal Kingdom to Magic Kingdom seems like a pretty good alternative to the 45 minute (20 minute wait + 25 minute travel time) bus trip.
Again, before things get out of hand, I'm probably way off base with this...just trying to see what travel times might be.
EDIT: I probably missed some of lockedoutlogic's juicy sarcasm...because that's how little I know about this system.