To take this in another direction (derailment ahead) the idea 'what the Director intended' can only go so far...
For instance, Aeon Flux was filmed in 1080p (I'm not totally sure of this, but even if it's not it suits the example). So what we're seeing now is basically 100% true to the director's intent.
Eventually High Def will move to Ultra HD (4k?) and beyond. Now would upconverting a movie FILMED in 1080p to a 4k+ resolution be staying true to the Director's intentions ?? I'm sure the movie will look better upconverted, but are we supposed to suffer at 1080p (and I'm sure there'll be a day when 1080p is looked upon like SD is today) ??
Luckily most movies are on film, so 4k+ Ultra HD won't be an issue with those movies, but still, those pesky digital movies pose an interesting question.