It would effectively be reversing what Broken Steel did in F3, or making Skyrim like F:NV. And no, I don't like the idea. If you're going to have a terminating quest, make it a happy one. Like my old idea for the moot quest. You become High King Dovahkiin!
QUOTE: There's a reason gamesas released the Broken Steel DLC for Fallout 3. In case you didn't know, the DLC "fixes" the death of the Player Character and the subsequent Game Over screen.
It was also because of the incredible stupidity of the vanilla ending.
Spoiler Even if he has a radiation-resistant follower, the Lone Wanderer is forced to kill himself anyway. That's not heroism, it's suicide.