failed?
Don't know how many units Ruger sold of the old tube feed model, but enough to keep the carbine on the market for many years. The mag fed model was the logical upgrade, along with tighter twist rate and easier manufacture, but with Bill Rs death, the bean counters at Ruger didn't see the profit they wanted. That and the rage for anything tactical or long range, killed the .44's.
Result, a very practical woods carbine bit the dust. Both models bring top prices, and I suspect more than a few are being bought by hunters and shooters not just collectors.
A 10-15 round box, a poly stock or folder and a rail, and Jeff Coopers "thumper" would have been a reality.