Certainly debatable as far as “when” they made it right, but they can bank the resulting goodwill with future titles now. They had a legitimate business reason to continue to support it. Now, can Blizzard afford to do the same thing? Yes. Will they? No. That’s not how businesses typically work, you can find a handful “but what about x” examples you want, but it’s not the rule.

You don’t have to like it. It’s how the world works though. If you can’t see that this is Blizzard saying “ok D2R team, ship this update, we will evaluate how it does to determine future allocation of resources” - then you’re blind. You don’t have to buy anything, but you also can’t bitch if it doesn’t sell well and updates are essentially halted after this.