Lazily borrowing everything from Language Log, I offer up “mistakeholders” for contemplation:
The people who have come to rely on features that are actually implementation errors are called ‘mistakeholders’.
My assertion: there has GOT to be an example of a Chinese character created in error through mis-copying, mis-remembering, what-have-you, that subsequently was accepted into the realm of legitimate hanzi. The existence of such would make us (users of the script) all mistakeholders.
Sounds like a job for a hound of hanzi history. Anyone?