But club costumes are probably a pretty high margin market and with a lot of DIY people making costumes out of the latest neatest thing.
I don't know why you wouldn't be able to play recordings of electricsheep or something though, or just use a microphone to do effects based on audio. I'd imagine this gets adopted in costumes way before it's in something broadly used.
From the videos I've seen of this kind of EL wiring, you're doing a diservice to electricsheep if you're saying this kind of thing can generate the graphics quality of sheep. It is funny(coincidentally) as I have the AppleTV 4k ElectriSheep running on my TV while reading HN and listening to choons. The stuff in this article can't hold a candle to it.
EL stuff has been around for awhile. The one thing this particular post makes impressive is the sheer size of it working. As soon as Lady Ada brings out these kind of rolls, then we might see some cool monochrome environmental input animations. What I'd love to see is a durable fabric with individualy addressable LEDs woven within that is as durable and washable. Then, maybe we can see some sheeps on clothing.