There are many other milestone designs that are not being reproduced commercially. For example, the Ferguson flintlock breechloader. In general, these types of guns have a limited market, and even that market is fractured. If a manufacturer makes modifications to satisfy the shooters (such as changing the ammo from .44 rimfire to .44-40 centerfire, as in the repro Henry, or the caliber from .54 to .58, as in the repro Harpers Ferry flint pistol), it turns off the historical purists, and if it doesn't, it turns off the shooters.
I certainly don't see enough of a market for a resurrected, heavily modified Volcanic to justify the tooling costs. A manufacturer is almost guaranteed to lose money on this.