The idea of digitally remastering a film has become a much more controversial topic since we can now clear the picture as well as incorporate deleted scenes or add something entirely new with CGI or with blue screening. With these features, we can do almost anything to these films to catch them up with the 21st century. Even so, I really think nothing should be done to these films.
These films are designed in a specific way in accordance with directors' wishes. As such, they are done in ways unique to them alone and to no one else. To take what has already been done and change it would only make it a different film. No matter how closely two movies may be related, if there are differences, then they are two separate films connected only by similar stories.
Besides, what would be gained by digitally remastering any of those films?--a clearer view of the same story?-- a colored version of the film?--not much to look forward to after spending so much time and effort in remastering these films. In the long run, remastering seems to be a way to carry these films along with us through time so future generations can enjoy them as well.
It has been my experience that most companies only digitally remaster films that were popular in their prime, or when they were first shown. Popularity, as I understand it, is determined by ticket sales and later methods of distribution. Those numbers may not always be right, and companies may go to the trouble of remastering films that no one wants to see.
Digital remastering can make good films better, but sometimes this practice is not necessary. In the case of the films viewed in class, it is not. These movies tell classic stories, so I think the black and white look of most of them helps benefit the stories. In the end, it all comes down to the personal preference of those involved.