I've approximated that to link all the parks, resorts, waterparks, and downtown areas...it would cost roughly about 2 billion dollars. (Non-elevated track...and roughly 75 miles of it)
Say they charged $15.00/day for parking and the use of the pods. (You could add it to the room cost so resort guests would think they're getting it complimentary). And say, that they took $100,000/day (average) and put it towards the project. To make their money back...it would still take them 55 years.
Wow, looking at those numbers, that doesn't make it sound feasible at ALL!
(Less if you count the savings on oil and drivers)
ah, but you are forgetting the goodwill of going green and the possibility of government intervention in the form of grants, etc. for reducing carbon emissions, pioneering a large-scale implementation, etc.. Not to mention the money saved (which you touched on) for reducing or eliminating the need for buses, drivers, fuel, maintenance, etc..
Also, I sure don't see much mention of the efficiency of the routes of pods vs. buses. Last year, we were at WDW for 12 days. We spent about 11 days riding buses from place to place. THEN, we rode the monorail from MK to the Contemporary. You try doing that, and you will see the obvious difference--no stop signs and no red lights. The monorail skips all of that. So, although you might need quite a lot of pods, I think the travel time--and, hence, the "recycle time"--of the pods would be better than that of buses--meaning you would need less overall capacity vs. buses.
Now, I'm not saying that this new system is coming to WDW. It would be cool. I have no idea if it would be cost effective. As someone mentioned, I think it would be an attraction in itself--at least for a while. So, if you can spend $250 million on EE (did they? I don't know), you could spend the same on a partial system that may actually pay for itself in increased bookings, reduced bus costs (fuel, labor, etc.), free publicity, etc..
What about a small pilot system that goes from a premium resort to a park? For example, from AKL to AK. All of a sudden, you have an added incentive for people to book those rooms. Also, isn't there a DVC at AKL or nearby? Yet another incentive for people to buy. In time, more resorts could be linked to nearby parks, etc.. They wouldn't have to lay down all 75 miles of track at once, and they could use smaller runs as pilots for determining the feasibility/ROI of future/larger routes...