I didn't bother reading what other people said but I gathered this old content you speak of is pre 50 stuff. I am a casual player and have been since day 1 of 2.0
I don't have all my jobs leveled to 60 (except crafting) so once in a while I run the pre-50 stuff "old content" and I have no desire for it to be a fast jump to 50. Honestly it doesn't take that long to get to 50 anyway and I do a lot of levequests since I like to solo sometimes. I enjoy this game and I still play the old content same way I did when I started playing this game. If you do the weekly challenge log and your daylies you will get to 50 fast enough.
So it is definitely not dead to me...