They should be able to increase the margin of their meager sales at the least, with a history like that.
Well, if their brand is that strong, that itself allows them to start making something else - you know, "from the makers of <stuff_that_just_wouldn't_die>"; won't need much brand building and convincing because people are still eating the pudding containing the proof.
I know of a company that was a national leader in a certain kind of industrial equipment. Now that the industry isn't expanding in this country, they can't sell anything because what they sold decades ago was designed for excellence and just won't die. Nearly all business now is occasional servicing of their old equipment.