Ir would be interesting to know real number of Bitcointalk members, excluding bots and alts. Because large number from these 3 millions hasn't even made single post here.
What we can find out if we look
Active users and top posters on Bitcointalk.org in the past 7 days that the number of active users in that period is 15207, of which Newbie 3178, and brand new 8611. It is easy to conclude that a fairly small number of old members are active (in total 1341 Senior, Hero and Legendary).
So the overall situation is pretty sad.
I can only tell you that the number of active users was half as low there somewhere during 2019 and early 2020, so this number is not so bad.