My Disney friends who design ride vehicles were concerned with the Model X interior; they announced it wouldn't remain looking good with guests entering and exiting. Detailers mentioned it is a "show car" and
recommended clear bra protective wraps.
The quick solution could be for the kids to remove their shoes. However, it would be wise to ensure that the 2nd row seat movers are operating properly and have no gaps at the moving plates.
Safety first, so IMHO, it would be best for the shoes to remain on. Would you consider putting blue protective booties on the kids shoes?
Disposable Shoe Covers :: Disposable Apparel :: eSafety Supplies, Inc.
On earlier threads I mentioned Con-Tact® Brand - Creative Covering™ - Black. Various colors can be found on this page:
Con-Tact Brand | Shop
The challenge are the curved surfaces, and
the entire bottom surround of the 2nd row seats are in the shiny black plastic. Chrome trim adds to the beauty and the possible damage that can occur as the trims are scratched or accidentally detached.
The great news is that the driver and passenger front row seats have a softer surface at the bottom rear portion. That will help IF the kids in the 2nd row keep their feet under the seat in front. If they put their feet higher up on the shiny seat backs, then protection should be considered. The rear row seats face 100% shiny black plastic. The back of the 2nd row and the wheel wells are a challenge to keep scuff free.
This situation may be answered by 3rd party solutions, but how much money do you want to spend? Would it be cheaper to have Tesla replace the damaged surfaces at trade-in time? If you are leasing, how much damage will Tesla accept? Interesting questions and I hope that Tesla Motors considers a ruggedized version of Model X in the future.