Tim, there already are revolvers that will outshoot the ROA and have done so in international competition. That doesn't mean they "supercede" it, since they're not mass-market priced. But the R&S design, for example, is every bit as capable of inherent accuracy as the Ruger, and can be tuned to best-in-class performance, as Pedersoli's competition offering has demonstrated.
"Modern lockwork" IOW a coil mainspring? Overrated. Do the top CAS competitors all use Vaqueros? No way, no how.
Modern steel matters more than a coil spring. All those SAA's that get beaten to hell most weekends have the same lockwork as a BP revolver. My SAA clone with good springs has amazing trigger feel and excellent practical accuracy, limited only by the sights.
So I question a lot of your premises. Do you write for Ruger's catalogs?
As far as I can remember, I haven't seen an ROA in person since the early '80s. That doesn't mean there's anything wrong with them. They're fine guns. But the marketplace isn't exactly clamoring for another BP revolver that doesn't have a 19th-century appearance.
My state requires single-shots during BP season. If I could carry a revolver, a stainless ROA would be a top choice except for its heft. But as it stands, I've never been too interested in one, not because it isn't a good gun, but because due to limited practical use, I'm more interested in a vintage design if I'm shooting BP. Ditto for most of the market, apparently, since there are whole companies that have become successful selling quality replicas since the ROA was introduced.
I think that "supercede" is a word that doesn't happen too much in BP, except for the inline hunting rifles made for those who never wanted to shoot BP in the first place. Quality, though, does matter and people do want it and will pay for it.
I guess "supercede" without a lot of qualifiers implies a critical mass of acceptance, too. The 870 superceded the Model 12 as the pump gun in American hunting, as the 390 overtook the 1100 and the 1100 overtook the Auto 5 before it. That doesn't even mean it's better.
The ROA may dominate certain competitions, so something could supercede it in that arena. But it doesn't have mass market dominance.
(For the record, I'm a happy owner of multiple Rugers, and I'll be buying more. I have nothing against Ruger, their revolvers in general, or the ROA in particular.)