I'm not opposed to the idea of branching paths... BUT...
They've done this sort of stuff in the past, specifically with ScreamHouse in 2002. Midway through the house (while in the basement), there was an area where you could go left or straight. Going straight would lead into a red "torture" room. Going left would bypass it completely. What ended up happening was people would leave the torture room and, instead of turning right and continuing through the house, they turned left into the flow of people. Then they'd turn back into torture room in an unending circle of stupidity.
It sounds insane, but people would go through those two rooms (the basement and the torture room) in a circle for five-ten minutes at a time. One group spent 45 minutes in the house simply because they couldn't figure out how to turn right. By the third week, the torture room was blocked off.
Something similar happened in the shower room in 2003's Psychoscarepy. It was a open space with a wall in the middle you could circle. A people would, getting so turned around they wouldn't know how to get out (despite the face there were only two doors, an entrance and an exit).
There's a big reason haunts are so linear. Most people have a hard time navigating mazes without any pressure. Combine the unknown with constant dread that something is going to job out at you at it becomes near impossible for people who don't enjoy that environment. Simply put, guests can't be trusted.