There might be a perception of potential legal problems as well, though that isn’t clear, actually.
I suppose if there were a perceived market for it, they (Revell) could clone the kit, but I don’t see that happening. If there was anything left of the tooling, I suspect it would have been sold off to Atlantis…
That said, I’m not really into show rods so all this is inconsequential to me, aside from it being an interesting story.