The fucking trees and fucking grass... Alright, imma go now. Bye.
Also as you said we really don't know how long the corruption of the land takes exactly.
Lastly we can guess that it will corrupt the land based on Andorhal and what the Argent Crusade NPCs say with regards to the Forsaken intentions.
It also makes the Argent Crusades actions in EPL almost silly considering what Sylvanas is trying to do.
1. it is not growing. 2. Look at those shitty branches, you're gonna tell me they look healthy?.
There are trees just like the one growing in ooze all over. Here are some in a completely healthy area.
"Terror, darkness, power? The Forsaken crave not these things; the Forsaken ARE these things."
The common man is like a worm in the gut of a corpse, trapped inside a prison of cold flesh, helpless and uncaring, unaware even of the inevitability of its own doom.
OMG 13:37 - Then Jesus said to His disciples, "Cleave unto me, and I shall grant to thee the blessing of eternal salvation."
And His disciples said unto Him, "Can we get Kings instead?"
The Argent Crusade will more than likely try and finish fixing up the plaguelands, eventually turning to Sylvanas.
Ner'zhul cast a plague of undeath - which had originated from deep within the Frozen Throne, out into the arctic wasteland. Controlling the plague with his will alone, he drove it straight into the human village. Within three days, everyone in the settlement was dead, but shortly thereafter, the dead villagers began to rise as zombified corpses. Ner'zhul could feel their individual spirits and thoughts as if they were his own. The raging cacophony in his mind caused Ner'zhul to grow even more powerful, as if their spirits provided him with much-needed nourishment. He found it was child's play to control the zombies' actions and steer them to whatever end he wished.