Quite honestly, it would not work out for them to actually say they were sending guests to Mars on this ride. For one, this wouldn't be realistic with a 5 minute ride, secondly, you'd have to theme the entire post-show area like Mars, which would feel very much like Tomorrowland, simply unrealistic (there isn't much to look at on Mars...). Furthermore, if you take guests to Mars, how are they getting back? Do they have to ride twice, or are we going to use a Star Trek-y beaming system? It simply would not have been realistic, so I'm glad they went with the training mission story, instead. Furthermore, given the ride system, no matter what, it would have always felt like the next generation of the video game. At least by calling this a simulator, this doesn't hurt the story for us. It would were they trying to say this was a real rocket going to Mars...not to mention trying to hide the ride system would be rather difficult.