I don't see any reason for retiring Gallery Game; it's better than Pick-a-Number.
It's Optional never had any official reason for being retired either, but my guess is that inflation could be difficult with the options.
Some games like Range Game and Squeeze Play live on after their mechanical systems failed. I feel Finish Line and/or Hurdles could have easily been adapted to become manually operated.
And, if forgetting to mention rules could retire $uper $aver and set problems could retire those mentioned above, I'm really amazed Flip Flop still exists.
The panels have gotten stuck, the reveal has gotten stuck, the button has fallen off, and at least three times Bob forgot to mention the ability to flip and flop and/or say that flipping and flopping is wrong and each time it's been right. And that's when you don't include the cheaters.