Well.... I don't want one, since I'm an 1860 man all the way.... but I did write to them yesterday, just because I got that kinda time and like to get answers, and got this back today.....
This e-mail is in response to your question or comment of 03/09/2016
Request No: 3xxxxxxx
Comment / question:
Why doesn't Ruger offer an occasional run of the Ruger Old Army black powder revolvers? There is a huge demand for those, and it might not support a fully maintained line, but it would certainly sell out a special run every few years.
Response:
Unfortunately, we have no plans at this time to reintroduce this model.
We will pass along your request to our sales and marketing department for future consideration. Please keep checking our website for updates, new models, and availability. Thank you for your interest in Ruger.
My personal thinking is that it's because of liability. In today's world, I imagine they would have to put a safety on it for legal reasons and that would probably really hurt sales if it weren't the original ROA, not to mention a costly redesign of the thing.