So if I can change just one person's mind, it's one more point for our team.
Yuck. Certainly not my team. I will fight you on the beaches, I will fight you on the landing grounds. I will fight you on the fields and in the streets. I will fight you on the hills. I shall never surrender.
You think my hypothetical scenario is implausible? Try imagining if Kim Kardashian looked at a pink dress and said, on TV, that it was chartreuse. If you don't find that thought as sadly believable as it is chilling, well, I'm nothing but envious.
I think if that happened, social media would instantly be full of people mocking her, just as they mocked Jessica Simpson for the Chicken-of-the-Sea incident. And if social media didn't instantly fill up with mockery, I would say that that demonstrates that the current meaning of the word is not important enough to bother preserving (much like "terrific" or "decimate"—we survived the change in meaning of those terms just fine).
Frankly, I don't see much difference between someone who insists that decimate must mean one-in-ten, and someone who insists that chartreuse is pink. They're both idiots, they're both wrong, and they both have a minor potential to influence the language in possibly-unfortunate ways. Different types of idiots, admittedly, but both still idiots whose influence is mostly bad.
So yes, if you're honestly suggesting that decimate should still only mean kill-one-in-ten, then my respect for you is equal to my respect for Kim Kardashian.