Sales < expenses.
Lots of folks are now going bananas over the HK P7, which went out of production quite a while back. Really interesting gun, all steel, etc. They were finally selling for nearly $1k in a marketplace that was filling up with polymer guns at $450. HK simply wasn't selling enough to keep a line up and running. No government contracts, not enough civilian sales, dump it.
Makers keep churning the product line to keep sales going, they don't make the Opel GT or Suzuki Samurai now either. And yet they are good cars that if on the market now would do well - I think.
The public? Apparently not so much, they lost interest and the makers moved on, too.