You have made a step to educate people to Bitcoin. Congratulations for that.
But, does people actually care with that sticker without knowing and listening what that is? It's the same as you received a poster about some kind of technology that you have never heard of before then the chance you would throw away that poster is really high and then so does people feel there.

I'm not trying to make you down or something but it would be better if you just give them a sticker regularly and tell them about Bitcoin to educate them, that's way more meaningful than just a bunch of sticker without any follow up.