(Spoilers) Was Medivh referring to Argus?

I just did Return to Karazhan again, and it struck me what the meaning of Medivh's riddle is."It may be simpler to shut a door than to pass through it, but sometimes a step into the unknown is required to break the bonds of fate."The door is the portal to Argus, he's saying that it might be easier to close the portal but going through and fight the Legion there, but going into the unknown is what will be needed to stop the Legion and save Azeroth.