It would require Apple it care about VR and gaming and VR capable GPUs. Except for a MacPro, no Apple devices are powerful enough for VR. Even the top end MacBookPro at $19000 still has an underpowered GPU below the lowest VR specs.
That top end MBP has four thunderbolt 3 ports; have you tried any of the egpu setups? (I haven't, but I've been thinking about it for my 5th gen x1 carbon with thunderbolt 3)
Sorry, bad memory. Still that's beside the point. The point is Apple so far is neither game nor VR friendly. I hope they change that stance. I'd prefer to be on Mac 100% of the time but I have a Windows machine as well because that's basically where all VR is happening.