On the contrary it's best to keep people as still as possible. The second people start trying to move around with a VR headset, the motion sickness becomes much worse. You completely lose perspective of where you body resides within 3D space which really plays with your senses in a way the brain isn't used to. Adding outside motion to the VR motion (even if the two are synced up) will lead to very uncomfortable situations for many riders. Everyone has different reactions to VR and there is generally a bit of a curve until you get used to it and the nausea isn't as big of a deal. I can't imagine this will be a very good first experience of VR for many riders and expect it to be fairly uncomfortable for a lot of people.