Supposedly you can train yourself out of motion sickness... at least that's what I've been told about flying and being in boats on water. I certainly don't get as motion sick flying now as I did when I first started. You have to make the connection in your brain between the movements you expect and the movements you see. Not sure exactly how you'd train yourself to do that... but I for one believe it's possible. Now whether or not it's worth it to go though the amount of motion sickness you'd have to go through to train yourself out of it is another question.