The term 'image macro' has largely fallen out of common parlance. It is a loss of distinction, but not necessarily a loss of functional speech. When people are talking about memes in the Dawkins sense, they know they aren't talking about image macros, and when people talk about memes in the sense of internet comedy, they don't get confused. The only confusion that arises is when someone is trying to explain Dawkins memes and has to dance around the fact that the term has been hijacked by the culture.

A failed meme is still a meme.