Original found here.

Quote Originally Posted by Alienmonkey
I play nin as my main, and I have read some posts saying that ninja is only good in abyssea because the mobs are easy. So does this mean when content goes back to being challenging that nin is no longer going to be of any use?
Reopened this because there was no reason for this to be closed.

My opinion:

Considering there are three types of DDs now, the 2 hander, the 1 hander, and the dual wielder, then yeah, 1 hander jobs might be useless. Although....what are the 1 hander jobs? PLD and BST. Yeah, they have their own uses, one is tank, the other soloist. Don't see them hurting in the DD department much.

As for your NIN, if you don't suck at DDing, you won't lose your place as a DD. Since DDs mainly equal tanks now, you are safe as a tank for a very long time.