Why on Earth would I choose to watch a movie on cable in this day and age? Because I want a cut-down version with commercials inserted?
Speaking of ways movies weren't meant to be watched...
Ideally, I'd own every movie ever. That way I could watch them the way they were intended. Since that's not really practical, I watch some things on cable.
Plus, original aspect ratio isn't that important to probably 90% of the population. That's why I think it would have been great to offer audiences and content providers a 16:9 option.