I think FFG is making a mistake here, and potentially creating a lot of bad feelings against them. I see no reason of weight why the old deck cannot be valid for 2016.
Either the old or the new deck must be valid, you can't have both where you pick and choose what deck is most advantageous to you and opponents are each using different decks.
It is like that right now and I see no brimstone falling from the sky, dogs and cats living together, nor mass hysteria.
Edited by Azrapse