It saddened me years ago when Colt discontinued the Diamondback revolver. But honestly at the time, I really couldn't afford to go out and buy 10 of them to make me feel better. Some might say... oh, but they are so valuable now. Well, that was over 25 years ago and yeah, they are valuable now. But until around 2000 (14 years after being discontinued.) you could find them for around $400-$500 in mint condition. So, maybe I'm comfortable with the way things are today and I don't dream that somehow Colt will bring them back.
The semi-auto Weatherby Mark XXII 22 rifle was another one. But frankly, Weatherby had them in their catalog for a lot of years and I only bought one. The bolt action Mark XXII is another story. I knew it wouldn't last under present economic conditions. Few will spend $900 or $1000 on a 22 rifle.