After being excited for VR for so long, now that it's finally here it turns out what I actually want is the ability to do all this with my mind whilst laying in bed rather than having my eyes open and exercising.
Probably because it's the wrong tool for the job. If you want to play games, a Mac is easily one of the worst ways to do that.
The eGPU method of bolting functionality onto a platform which doesn't want it is only neat on a technical level at best. It is essentially the world's biggest dongle.