How Many Misuses Destroy The Metaphor?

I receive every day, as most of us do, more email messages from those looking for contributions for political campaigns or organizations than I care for. Give once and you're on the list. In my case, a left-leaning group, whose identity I won't reveal, as anonymity would be more flattering. In listing the crimes of the Trump administration, the writer asked "how many more shoes will drop?" Good question. Traditionally the options are limited. So the answer to the rhetorical question, in this case, would be just one. Which would be fitting, as I believe the original metaphor is "waiting for the other shoe to drop," Meaning that one, telling, damning incident has happened, and it is apparent that a subsequent, equally if not more incriminating event is more than likely to transpire. But through everyday use, as happens in language, but it would seem particularly through the internet, words and metaphors, catchphrases and jargon proliferate spread, more rapidly than ever. Hardly a novel observation, but when it comes to how many shoes we allegedly now have, perhaps we should remember that shoes fall from feet, and I don't know about you, but I still have just two.