What happened here?

"What happened?" meaning why did wall pockets go the way of the anti-macassar?

It's rare to go to an auction and not see at least one, but why aren't they making them anymore?

Most of what completely disappears goes because it's no longer needed -- wall-mounted match safes above the kitchen stove, for example.   But these were almost purely decorative, and most people still live in houses with walls, correct?

Wall pockets came in a staggering array of designs and materials, and they still look really neat on a wall.  So you should maybe start beating the bushes (thrifts, flea markets, yard sales, auctions) and find a few to put up.    

You really should.