I think the issue is the .41's practicality. Sourcing ammo without having to hoard it (even in normal times) when you stumble across it is a big deal.
The 9.3x72 is a good round for large and dangerous North American game but it loses practicality points for being hard to find.

No question the .41 is a good round but it languishes in the .44's shadow. It's ballistics aren't obsolete but the lack of popularity driven by ammo availability and the .44 taking the limelight could drive it further to obscurity.