Yeah obviously they have to be extremely easy cause also you have to do it in groups, it has to be relatively solvable for any valid mental age that has parallel thinking. But more than the difficulty, what would 'disappoint' me would be the scenario. We got used to see every time more surrealist scenarios on the submachine games and others, so these real places would be like solving a basic level 'escape da house' game.
Real life room escape is already quite old in my city.
And talking about the Japanese, they're not only the first people to make Room Escapes, but they're among the first people who make decent flash games.