There will be a market for CDs and LPs as long as at least a few companies continue making them, though it'll never be at the level it was in the past. 41 million LPs is a lot, but still no where remotely close to the nearly 350 million units sold in 1977. .For CDs, the top figure was over 900 million CDs sold each year in 1999 and 2000. And remember the population was much smaller back then.
Heck, there is still a market for buggy whips and horse saddles, though nowhere near the product volume and number of manufacturers there were in 1890.