Originally Posted by Alrik Fassbauer 
Personally, I see the future in more & more MMOPG elements being added to SP games …
- Crafting
- customization
- player generated content
- housing
- social interaction with NPCs
"Ghosting", by the way, is actually an almost "ancient" game feature : Jut look at the "Bones" files in the Nethack/Amulet Of Yendor game … Maybe other Rogue-likes have that implemented, too ?
I'm actually surprised that no developer ever tried to implement this feature …
Most of those actually predate mmorpgs and originally came from SP rpgs. The only one that does come from mmorpgs is (I think) crafting.