I've noticed a decline in responses on Super User over the past few weeks/months. I'll admit that I don't necessarily follow it all that well in the first place, but it seems as though questions asked there can fall into a black hole vs. Stack Overflow.
Has there been a decline in traffic to Super User? What about the rest of the trilogy sites?
If traffic is being lost, is it possible that the Stack Exchange sites are cutting into trilogy traffic and spreading the audiences too thin to make sustainable communities?