If I had to bet, I would say that AR glasses of the future will replace your vision entirely with a camera feed (called video-passthrough in the article). Today's glasses have a low field of view and lag, but these are only quantitative problems. They can be solved with gradual improvements. They're not physical limitations. The camera is right next to the display, so there are no fundamental speed-of-light issues. It's easy to imagine that, over the years, the lag will be reduced enough to be imperceptible.

The problem of drawing black with see-through glasses looks like a much harder problem in comparison.