Angel | Sam
Funny how people can get their hope and enthusiasm from entirely different sources, even when they do pretty much the same thing. Not that I'd necessarily call it 'enthusiasm', just that it feels good to know someone's alive because of me.
I would think that reversing it would send us back where we came from. I don't think it would necessarily involve erasing our memories. When I traveled in time and to multiple universes before, I remembered it. Dean forgot most of the time loop we got stuck in, but that was because he got entirely reset when he when it started over and I didn't. So it's possible that just coming here and finding out what's going to happen to them might allow them to make different choices when they go back.