Really, there's no argument here. We have to preserve the film and remaster it. The REAL question isn't whether it must be done, but how. i.e. How close to the originals do we stick? Especially in regards to the battle scenes in early TNG/DS9, which look especially slow and dated compared to today. Do we make them just as slow but with CGI? Or do we go back and take all the optical elements that were filmed and recomposite them in HD? Would they even be good enough quality to do so?
And of course then there's the issue of poor use of stock footage. Do we preserve that or no?