I think that one of the most interesting endings in Fallout is in Fallout 1 where you kill Rhombus. Here is the ending.

The Brotherhood of Steel, under new leadership after the death of Rhombus, becomes an overzealous, techno-religious dictatorship. In 20 years, the Steel Plague devastates the newly formed New California Republic, and starts a Dark Age that could last a thousand years.

So tell guys, what do you think the Steel Plague is. A expirement the BOS were doing but went horribly wrong, destrying most technolgy, forcing the people of the wastes to go back to mecanical technogly?. What do you guys think, because I bet its one of those endings that makes you have to think of what happned. I tried looking at other Game endings like Deus Ex where if you destroy Aquinas, the Internet goes down and others.

I also had my friend ask this question to J.E Sawyer but there is no response yet. Maybe he is thinking.

Well hey, it destroys the NCR, whats not to like?