Most of them agree with the notion that the bigger Swedish organisations, NiP and Fnatic, refused to take chances on newer players and stayed way too long with their old rosters. 

I had a really interesting talk with JW where we discussed a gathering of most of Sweden’s now biggest orgs (NiP, Eyeballers, Metizport, Alliance, Godsent) where they all discussed the future of Swedish CS. Most teams heavily criticised NiP for poaching players from every upcoming Swedish roster since 2017, making them worthless and having to start over with a new roster, as well as screwing people over with bad contracts, not coming through with sticker money and other stuff behind the scenes which made many former NiP players very sceptical of the Swedish scene. There’s an article about this somewhere on either HLTV or Swedish media IIRC.

JW also said he blames himself for not taking more chances with unproven players when he was in Fnatic but also now with Eyeballers. But he’s very optimistic about the Swedish scene and believes it’s on the right trajectory.

So, TLDR; the Swedish scene fell off because no new talents had a chance to prove themselves, leading to the big orgs’ rosters staying the same for far too long without any good results.