1) Toy Story was made a long time ago, 22 years ago in fact. As stated by tikhonj, Toy Story would be pure legacy code by now, as so much has changed technically in 22 years. Getting it to work in modern software that could render it in 8K would be very difficult, as it was already difficult enough to re-render it in 2010 as tbabb's comment explains.
2) There's no point in upscaling in 8K. Yes, it would be in a very high resolution, but a lot of the textures were made in the 90s and are obviously not made for 8K. I would imagine that you would have to remake essentially all of the textures, otherwise they would probably look terrible in 8K.
Besides, there's no point of re-releasing it in 8K, because it wouldn't all the detail that rendering in 8K normally come with.
I think the assumption in the parent - which would also have been my guess - was that assets begin in higher resolution than required and get sampled down. Certainly used to be the case with games.
1) Toy Story was made a long time ago, 22 years ago in fact. As stated by tikhonj, Toy Story would be pure legacy code by now, as so much has changed technically in 22 years. Getting it to work in modern software that could render it in 8K would be very difficult, as it was already difficult enough to re-render it in 2010 as tbabb's comment explains.
2) There's no point in upscaling in 8K. Yes, it would be in a very high resolution, but a lot of the textures were made in the 90s and are obviously not made for 8K. I would imagine that you would have to remake essentially all of the textures, otherwise they would probably look terrible in 8K.
Besides, there's no point of re-releasing it in 8K, because it wouldn't all the detail that rendering in 8K normally come with.