I might be oversimplifying this - couldn't companies that want to take part in the parallel world set up local sensors around their building to estimate position to a much more accurate degree?
I'm thinking along the lines of "Want to be a Pokemon gym? Place these devices around your public space and we'll overlay our AR reality while people are there!"
I'm thinking along the lines of "Want to be a Pokemon gym? Place these devices around your public space and we'll overlay our AR reality while people are there!"