I’ve visited copper plants all over the world in a previous job, it’s still big business. So much scrap copper out there and it can be remelted and recycled over and over. Copper pipe is a key requirement for aircon and that market is only growing. There’s a good argument for copper
over plastic in plumbing too. I don’t think it’s going anywhere soon and I’m not sure what the argument would be for banning it in bullets.