Personally, I love the idea of an intermission; they harken back to the golden era of cinema. In addition to the practical implication of a restroom break, it helps break up a long film into digestible chunks. Also, the intermission would allow folks to refill drinks or snacks (increasing cinema house revenue) and stretch the entertainment time value of that $40 I dropped for a couple admission tickets.
In the early days of cinema, intermissions were required simply because movies were printed on multiple reels of film, and a break was needed once the first reel was complete, so the second could be loaded. Intermissions stuck around, though, well after moviehouses solved that problem with multiple projectors. That’s because they served another need: giving the audience a break. And some movies—Gone With the Wind, Lawrence of Arabia, Ben-Hur, Gandhi—even made the intermission part of their narrative structure.