Colt stopped making them to free up factory space to make guns that would generate more profits from less space, and fewer workers. The need for the master craftsman to make the revolvers was also gone freeing up money from labor cost.
It is not they were not making profits from them. They just wanted to go to making something that generated more profit, from less expense.
There were other factors that I will not go into.
Besides my wife says it is time to go shopping.