Sure they pushed it, but they didn’t tell you if they’d indefinitely support it, do it for a year, 75 years, or what. That decision is up to them. If all manufacturers chose to stop loading 30-06 tomorrow that’s their decision, lot of customers would be upset, same with many rifle manufacturers, and customers of theirs but they’re not beholden to you, I, or another manufacturer and don’t need to explain themselves. Their only responsibility is to their shareholders or ownership if privately held.
Additionally, we’re not talking at a 6.5 Creedmoor that was designed by Creedmoor Rifles in cooperation with Hornady. We’re talking about a Win Mag Cartridge designed and launched in the 50’s by a company that isn’t the same as the one today making ammo today, and exists in name only.
There are good products that never take off for one reason or another, and bad products that become best sellers despite themselves or being nearly identical to something else. That’s not unique to the firearms industry or many others. Timing and Marketing have a huge impact on both. A company that launches a product (regardless of the industry) has zero duty or obligation to support it if they’ve made a decision to shelve or discontinue the product and in reality, they don’t need to make that decision just because it’s not profitable. In theory, they could make that decision to force you to upgrade as well. Maybe slow your processing speeds down, reduce battery life, or fuel mileage, design parts with reduced life cycles, should I keep going?
Furthermore how and what they do with their already manufactured widgets and components (regardless of industry) is the company’s decision to make. If they choose to dump them with a parts liquidator, sell them quietly (pre discontinuing), maintain them for warranty support, future projects, or to drive up value on them; it’s entirely up to the company.
You don’t need to agree, you don’t need to like it, but that’s called free market trade and capitalism. It’s also what allows you to go out and create your own company to service the niche you feel is under serviced and profit as long as you abide by any patent and IP.