It will certainly work for the vast majority that are using #include <stdio.h> and more importantly for the various GUI apps that are using GTK/Qt dialogs.
This is for security, though - you can't just assume it's good enough because it will work for most benign applications - you need to be sure it will work for all applications - benign or malicious!
There are other solutions such as seccomp (as siblings of your post have pointed out) that solve this securely, but LD_PRELOAD won't.
