First, this isn't so sad. He knew he was going to go, and we all thought it'd be last year. He pushed on till this year, so that's an accomplishment.
Second, his wife will be concluding the series. She has been a huge part of the books' development, and is the second expert on WoT according to Jordan himself. He's got a binder with all of the history and ideas in it, and she's more than equipped to complete the last book.
Sad, but not devastating. He'll be missed, but he lived a dignified and honorable life, and he had come to terms with death. We'll also get to conclude the story once and for all after his wife completes the books.
ᵗʰᵉᵇˢᵍ๒ᵍᵐᵃᶥᶫ∙ᶜᵒᵐ
ᴸᶥᵛᵉ ᴼᵑ ᴬᵈᵃᵐ