I don't know what game developers think about this, but have some personal opinions about film...
I think it's a very bad practice to do pop-out objects and it's been used only as gimmicks. Most talented directors use it very carefully and very sparsely, or avoid it completely.
Because the screen itself is further back from the virtual object, the screen edges clips the object in a way that cannot make any sense to your brain (so, headaches). No such thing occurs for far objects, because the screen clips exactly like a window would.
Your eyes also have a tendency to try to refocus on closer object, causing headaches because there are two different mechanisms in your brain that are fighting each other, it can converge but cannot focus. The eyes will always try to focus to the actual screen, which the sharp edge always provide a reference. The screen being the closest reference, it makes the eyes comfortable focusing there all the time, The eyes don't try to converge, and they don't try to focus. They will relax because everything is always sharp anyway from that distance and forward.
There are a lot of differences in screen sizes and distance (different theaters, TV sizes, sitting positions, etc...) causing a gigantic error with front objects, but there's a nice tolerance for back objects. What's interesting for VR is that there's an opportunity to have a "perfect" projection and in theory there's no actual "pop-out" since the screen is very close to your eyes. It's going to be a big improvement because it's the only way to get a 3D that is geometrically perfect for everybody.