You have to wonder why a company would make such a gun even if it would be durable. A modern, stronger spin on an obsolete technology? I have many top breaks, and the swing out guns to me are not any slower or anything than a top break.
You may reply and say "well people like top breaks, and shooting them" well of course they do. There are many affordable shooter grade examples. Uberti makes a modern S&W Schofield replica. To make one that would take high pressure ctgs would be a major financial blunder. Of course some people would buy them, but the reality is few would be made, and then people like me in the future would collect them
because its a bad idea, and that always makes something pretty rare in the future.