Many of the best pros retired, many stayed. Some went back to BroodWard too. Many teamhouses disbanded.
While there are still some teamhouses in Korea, many of the top coaches left, and it is known that the team houses now are much less structured than they were in KeSPA days. While I cant say this for sure, I suspect they might even be less structured that on the early days of pre-KeSPA sc2 with the korean eSF.
I suspect that no. While Serral, Reynor, Clem etc are great talents, I don't believe they would be comparable to Korean players if their scene hadn't imploded. I think they would be like Stephano. Very good, winning some tournaments, giving us hope, but ultimately being defeated over time by the Koreans.
While it's impossible to tell, maybe we could have a conversation and make educated guesses?
I know some foreign pros use these forums, and they have had experience in Korea at various points in their career. How does the training evoirment compare now to what was there before?