Wow, that's a good question, but I know I have never heard of such a thing. I think it would be hard to organize a trip because of the frequency of delays and cancellations. If you had a bus hired, you might still be obligated to pay for the bus despite having no real sight to see.
You might want to check into a few of the local towncar services. I know that they have cancellations policies, and that would all be spelled out on their websites. But if you knew in advance that you wouldn't need them, you could probably cancel. We have used both Quiksilver and Happy Limo with good results. You could also check into the cost of a taxi.
Keep in mind that you will not be able to get on to the launch area at KSC without a ticket for the launch, and if you purchase the tickets for the day of the launch, and the launch is cancelled, there are no refunds. The sticky at the top of the thread lists places to see a launch other than KSC. You will need to leave early as they get crowded, and that is something you would need to discuss with your limo/taxi driver. Also, you CAN see a launch from various places in
WDW. And while it's not quite the same, you would not have to even leave the property!
