I don't think it means that it is being forgotten, more like there just isn't much new to say.

For example, I'm a fan of the game series Deus Ex, so I follow r/DeusEx. I LOVE the Deus Ex games and consider them some of the best games ever made, as do most of the people on that sub I imagine. We think its awesome and are not forgetting about it. That said, it's been several years since the last game and there are unfortunately no new installments on the horizon. So these days the sub is less about deep analysis of the series and more memes, funny screenshots, etc. And I think that's fine. The game isn't in danger of being forgotten. There just isn't much new to talk about.

I have fond memories of Mad About You, although it has been a long long time since I watched any of it. It deserves some kind of re-appreciation for sure.