Interesting contrast between the North American and European handsaw markets. In the US, Disston had a huge demand, helped by the North American approach to housebuilding using far more timber framing than is traditional in Europe. Disston were very successful, and commercially aggressive, putting pretty well every other US saw maker out of business, and ended up as pretty well a monopoly supplier. However, being geared up for high volume manufacture, once sales dipped below a certain point, they just packed up making handsaws at all; whilst the Disston company still exists, it is owed by others and makes products other than saws.
By contrast, in the UK and Europe, there proliferated a multitude of smaller firms. As demand grew, the number of firms grew, and as it shrank, so did the number of firms. Even when demand was almost wiped out by the rise of the power tool, a few persisted - Tyzack Sons and Turner continued to produce handsaws as a sideline until their exit from engineering manufacture in 1990 (the firm still exists, though renamed); Roberts and Lee lasted even longer, and Thomas Flinn is still going. I'm not sure about continental Europe, but I assume there are still one or more makers going, since Dictum offer blades for the traditional continental frame saws.
Not sure what that proves, but it does seem indicative of something.