It's not just the NT scene in my opinion, but rather a general lack of activity on the national forum.
I can create more threads like the one I made in the middle of last season (I was going to make another for the play-offs but my computer froze when I was almost done), and in doing so hope to generate some activity. But otherwise I think the problem mostly lies in the recently dwindling user base on this game, and that of those that are still here, the majority are veterans who have already talked about almost everything there is to talk about on this game.
So in short, I'm not sure I can fix this lack of noise in the NT scene, but I will certainly try. I'll be using whitewind's post-match reports for the U21 NT as a benchmark as to what I myself need to be doing in regards to my attempts to interact with our community...