Many are talking about how people are less active because it is all politics, but I believe that's a problem with the organization of the page, and specially the front. On the front you see the most active, most voted and commented posts. That's good when it's one sub, or many subs with more or less the same amount of activity. But when you are subscribed to smaller subs, everything else is drowned under v/news and v/politics.
If the devs finally allowed us to make the fucking sets I believe that would be quite solved.