Yeah, motion sickness is a non issue at this point for headsets with good 6 DoF tracking as long as you are only doing 1:1 mapped movement (your VR movements match your real world movements). Teleporting is mostly fine but rapid frequent teleporting can still cause some issues. Other forms of locomotion tend to have more issues but some tricks have been developed and best practices figured out to make it viable for many people for reasonably long sessions. Virtual "blinkers" to reduce optical flow in peripheral vision have proved quite effective and are widely used. Pulling yourself through the virtual environment with your hands also seems to work quite well for many people (see Lone Echo for example).