Earlier quoted context omitted.
There are lots of non-3D movies made; the fact that 3D movies are also made doesn't stop you from watching a "normal movie" like a "normal person".
The fact that no theatre nearby will show a movie that has a 3D version in non-3D does.
If no theater around you shows non-3D movies at all, that might, but that's more a consequence of your decision to live in an area where 3D movies are apparently unusually popular (or non-3D movies unusually unpopular) than anything else.