The NW scene is still very lively on the EU side, yes a lot of long term regiments have died but there are still a good few around and a lot of events (tournaments, 1v1s, gfs, linebattles, etc). In regards to the German sides of things I think there are only a few 'German speaking' regiments nowadays the main one being the 23rd or you also have the 2tesGFR. 2ndHess is also German but I believe that it's no longer German speaking as they have a few non Germans now.
In regards to the German community
VonBergen leads the largest regiment and I'm sure he'd be able to tell you more than I can about the German community, or what remains of it.
2 years is quite a long time when you consider the DLC has been out for just over 6 years now so the community is of course in decline but it's still got a reasonable life ahead of it unless BannerLord actually comes out.