Naturally it can be disheartening, (not getting any, or the odd one reply,) for maybe some posters who started what they hoped could be a topic that might get some interest from regulars, or from people who just look in now and again. 

There are a few topics that have been replied to, yet the original poster of the topic didn't acknowledge the reply given. That is disheartening for the person that showed an interest. 

I suppose really as looking back a good while on RT great friendships were formed, that alone is good for them all, it was very active too, so of course the regulars would have noticed a decline as the years went by. But all forums are noticing that happen as well.