Soulseeker will be dead in a … ?

I'm really enjoying playing WoW Classic Hardcore on Soulsseeker. However, with the launch of the final phase, I realize that the population will likely decline quickly. I hope to successfully finish my run to level 60 and then transfer my character to another server. My main concern now is how much time I have left to enjoy the stable pre-phase 6 activity, with around 700–800 players per faction. I'm convinced there are already some statistics on this, since Soulsseeker isn’t the first Hardcore server.