I know this is an old thread, but I want to put in my opinion. They are making a mistake, remastering in 4:3 aspect ratio.
If they are going to remaster TNG, then they need to do it right. This means, keeping the original 35mm aspect ratio, and NOT do 4:3 aspect. They messed up, remastering the TOS series in 4:3, when they should have shown the full 35mm frame.
The original 35mm film before special effects, probably exists in storage. This original film is NOT in 4:3. Yes, it may have props, lighting, or other stuff in the frame on the sides. But this kind of stuff can be erased and fixed with VFX software.
Just give us the full 35mm frame. NOT 4:3.