I agree that it won’t happen for many years, and that above 5K the transfer is only going to capture more details of the film itself such as the grain, holes, dust, and focus issues… as opposed to capturing more details of the cels. Also, any improvement going from 4K to 5K will only be noticeable using special tools, not normal viewing.
I was just pointing out that since a 5K transfer was made, they most definitely have it securely archived so that several years from now they can monetize it. The fans are so obsessed now that any minor improvement they will pay for… and that is a good thing. Just look at their 1080p transfer as a good example. They sold it twice. The first one with censorship (2012) and the second one without censorship (2016).
Back to the normal programming: this 4K release is the best yet and definitely worth buying. I’ve watched it twice this weekend.