This will be my last answer on this topic, if you still have doubts, please read back and carefully my previous posts!
If by active topics you guys mean a topic full of screenshots, good luck and complaints about breaking rules, then I prefer not to have active topics.
... but every day I see the same 20 or 30 people posting something. You (all the authorities in OSM) should figure out how to bring new people here, this problem exists already for 2 or 3 years.
And we're not sleeping on this side.... OSM is not a game made up for those 20/30, as you said it's for 5M (I would love that we had 5Million daily users, would be really nice, maybe your source can make that happen)
It's true that forum users and forum activity are decreasing on past years but what you didn't said is why you suspect that happened... I've some reasons, because I do read , being one the fact that all new forumers just stop logging on forums because everytime they open a forum page, they only see events, crews, events, competitions, crews..... And when they create a topic to know a bit about the game, to discuss some feature, their posts is sent to 2nd page hidden in the middle of the screenshots topics and they just stop showing on forums and then they ask their doubts by mail to support...
We've been trying for quite some time to change this without denying these topics to be created, but seems that as someone said in this topic, OSM users don't read neither learn, so we went radical.... let's see how it goes. It may work and it may not work... only time will tell!
About changes on the game, competitions, crews.... again, we're not sleeping in here... things doesn't happen overnight, but they happen... just stay tuned!
About the new category... well, this option was/is still open, but at this moment is just ignore the problem and move it to another place.
When our users decide to learn what's the main purpose of OSM forums, then maybe we can have a category only for events/competitions.
As a last note: This 'policy'/decision is only to be implemented on English/global forums. Every single Community Manager is free to allow these topics on their communities, as long as they keep some space for OSM topics!