I think Lemmy should be it’s own thing. Similar to Reddit but not a full-on replacement. I do think an aggregated feed of similar communities on a topic ought to be a feature, but I think, hell, if 80 different instances want to host a politics, funny, fediverse then let them do it!
The reason why I don’t want there to be a “definitive” worldnews community is that only one group of mods/admins have all the say over what’s allowed for that worldnews. The other "worldnews"es can fill the niche where one is missing, perhaps critique of certain regimes is discouraged on one but encouraged on another. Perhaps posts about identity politics is talked about on one but is completely banned on another. Perhaps another world news is dedicated to making jokes and memes about current events, while another strictly allows only serious and on-topic discussion.
Sure, a mechanism to allow all these worldnews communities to appear under one page would be good as a feature suggestion, but to make any rule about “one definitive” lemmy community on a topic defeats the purpose.
I was trying to figure out how you got those numbers, then I went to https://the-federation.info/platform/73, sorting by number of accounts vs. active accounts. I was astonished how some sites had 30k accounts and 3 active users. Kind of sad seeing the active user ratio going from over 1 in 6 (very active) to 1 in 30 (around where it was before) in the span of 5 days.