What are possible reasons for a class of products to go the way of the Dodo ?

I can think of two. The one I usually hear about is development of a new class of products that make old ones redundant. Popular examples being ice or whip making industries. I don’t need ice and when I do, my fridge is there for me and I rarely feel the urge to whip our car.

The other one I can think of is a change of behavior as a consequence of a different price point. Burda used to be popular, but I can’t think of anyone who’d still buy it. Price of clothes and shoes have become so low that most people prefer buying a replacement than repairing the old one.

I have flatfeet and highly value comfortable footwear. Disappearing shoemakers are a real problem for me so if anyone can recommend one in Ljubljana or Maribor, it would be greatly appreciated.

Besides that, can anybody think of other reasons for product class extinctions?