Once Kespa fully switched over to SC2 I expected the ESF to self destruct. In a year or less, any remaining ESF teams will either merge or fall under the Kespa banner.
I actually expected it to be happening faster than it has. Kespa has a lot of money and pull with other Korean businesses. Kespa have been royally fucking up their transition to SC2 though, I hope they and OGN get their act together for the sake of the Korean SC2 scene.