> I can't even get people to stop using "weary" to mean "wary"

Interesting, I don't recall seeing that one before. Do you think people are mentally just adding a 'y' to the word 'wear' (and still pronouncing it in their head like 'wary') -- or do you think they are thinking of it as the real word 'weary' (having the long 'e' sound like the word 'weep')?

I think it's an unintentional merger of wary and leery.