motion sickness? most of the motion sickness happens when the environment moves around you without you controlling the movement. how i see this game in VR is that you move in your own space using room-scale spacial tracking. so it'll be very hard to get motion sickness. and if the map is too big for your room, just teleport around so it doesn't make your brain go "poof".
you're absolutely right about this game having the best potential, since this game is opensource.
i'm imagining this game in VR. it would be so cool dude!!! HYPE!