According to your link to box office mojo, number of tickets sold peaked in 2002, and has been declining since then, even as population has been rising.
In 1995 0.20 theatre tickets were sold per person in the world.
In 2016 slightly less than 0.13 tickets were sold per person.
This highlights 3 things.
- In the grand scheme of things most people in the world don't go to movie theaters and never have.
- Less do than ever before both in absolute terms and proportionally.
It seems unlikely that steadily raising the cost of tickets and food is going to be a sustainable way to avoid falling revenue in the future.
The smart money ought to be giving people the movie experience they want at home and giving people a higher quality experience out with a higher price tag.
The former will obliterate a lot of theaters and the latter is a smaller scale demand than the existing industry.