The 1997 and 2011 versions could inhabit one disc via seamless branching. Give the originals their own discs with plenty of room, and the third disc is every bit of deleted/alternate footage and maybe some vintage docs, hopefully restored?
They could follow Blade Runner’s example to the letter and have the first disc be the “final” version with whatever color timing and last changes George wants, the second disc be the 1997/2004/2011 versions all seamlessly branched (I’d want them to simply conform the color-timing to how it looked in theaters in ‘97), and the third disc be the unaltered version preserved as faithfully as possible.
Based on this recent article’s source’s claim that it will be “four discs per film for the 4k, three discs for the regular blu-ray,” I think the less ideal but more realistic prediction is that the three discs will be the final version, the unaltered version, and the extras, respectively, and the 4k version will be those same exact regular blu-ray discs but with a fourth disc that’s the “final” version on UHD.
I’d love to be wrong, though.