A great example that I can think of off the top of my head would be in the Wizard of Oz when the movie was changed from black and white to color. It was successful because it was one of the first movies to have color in it, it was such a great reveal of what was to come in movies.
I like your example, and that does seem like a big change because most movies before were just in black and white.
Good example of changing up the form everyone had grown familiar with. I am glad movies are in color now.
That is such a good example! Great pull of an answer. I completely agree that it was definitely a sudden switch but was done very successfully. Well done!