We know GL is apparently for the preservation of the old black 7 white movies,he's against colorizing them for whatever reason he got,but i say if he decide he can do or change things in the movies he made,he has no authority to say that old movies should not be colirized,for all we know the producers of these movies wanted to make them in color,but since back then the color films were more expensive they used the cheaper B&W.
So in short i say rto Lucas to STHU he has no right to decide if these movies should be or not colorized.