It is worth noting that the Soarin' visual presentation is not "video" at all, but a very large "film" format called "Omnimax HD."
It is a film strip (not electronic video) process that uses a very large "frame image" (compared to regular 35mm theatrical films) and a double-speed projection shutter (48 frames per second, compared to the traditional 24 frames per second of regular theatrical films.)
This combination of factors yields a MUCH higher quality image than standard film or video projection systems.
Dirt and other artifacts that attach to the film and/or hang up in the projector's shutter-gate ("hair-in-the-gate" is the common term) can be problematic in mechanical film projection at all times,
but with the Soarin' Omnimax...considering the short duration of the Soarin' film (lot's of "repeats" throught the day) and the high-brightness/high-contrast scenes (lots of "sky, clouds, snow") and the extra large image, and guests being positioned very near the screen, any of these pesky artifacts can be very annoying.
They can be eliminated (or severely reduced) by frequently replacing the film prints used in the show.
I have no idea how many prints that they actually use, but it is POSSIBLE that they keep some "extra clean" loops of the films around and can thread those in when they need a "VIP showing" or similar.
Just a guess.
Could they convert Soarin' to video projection?
Yes.
But, I doubt that the image (with the technology available today) would
be nearly as sharp as the current film strip shown.
Times (and technology) can change, however, so stay tuned.