As others have mentioned, it's heavily in use in streaming. I don't know that it offers enough of an advantage over vorbis as a file-format to overcome the inertia of devices that support vorbis; we'll see in a few years.
Perhaps here success is a measurement of producing a patent free solution that's technically competitive (performance, compression, other metrics), rather than popular and widely adopted.
I assume you mean more successful.
I have never seen or even heard of an Opus file in the wild.