Maybe. But you also have to question how complicated that might be to do. I'm not a coder or game creator by any stretch, but I imagine that might take a lot of time to do, let alone developing a co-op mode to begin with.
Possible? Maybe. Likely? I'm not sure. It's a neat idea, and I can imagine that if co-op did come around, they might end up doing something like that.
The difficulty of multiplayer is everything that has to "match-up" between the 2 players. e.g. physics objects moving, the state of the world (where is everything), data-races (we both put the same thing in our inventory at a similar time).
Individual scares are actually the easiest to implement as long as they are transient, i.e. they don't change anything permanent, like moving a chair.
