I mean something like that on the scale of an SNF season, not just a simple weekend tournament.
And yeah, by itself it doesn't really say anything. It's just a combination of a lot of different factors, that being one of them. There is, in general, less discussion about how to play well, less drive to produce content geared toward competitive play, etc. Based on your numbers there are more people playing and watching CoH now than in the past, yet there are less people participating in the game's competitive community. There are far less people active here than were active on GR. There's less proper discussion and more balance bitching. There are 16x more strategy threads on GR's CoH1 forums but only 2x more balance threads.
There might be more eyes, but there's dramatically less actual activity.
I get the feeling you may be slightly out of touch. Sorry.
Ipkai told you that streaming is more active now - a lot more goes on in those streams, than often appears on the forums. Streamers are up to all kinds of things - one may run a daily tourney, another may be casting viewers games and commentating. Others may be playing with, or against viewers. Others may be playing the ladder and analysing. And all the time, there is the chat - Twitch or hotbox - sometimes serious, mostly light-hearted, but often discussing stuff which otherwise would have been in the old GR Strategy sections, or "Ask the Strategist".
If there was a signal point you appear to have missed ,it might be this: how relevant is a forum now to fast-moving streams? It has a place as a meeting point, but streams mean any forum can no longer be the absolute centre of the universe.
This, of course, ignores the invaluable obs mode, currently underused, which enables a poster to view play on a certain map, or certain players etc in comparative solitude, from both sides. In the light of all this, replays are far less essential than they once were.
I used to think that the old formula of replays and mp3 was passe - I am close to concluding that you tube may also be entering that bracket, and really only exists to preserve replays, which would otherwise be extinguished by a patch.