The remake
If the planned remake doesn't end up in development hell or something, tghere is a couple of changes from the original I would like to see:
The little demons should be better looking. In the original, they looks like sad and old little men covered with black fur or feathers.
A more realistic explenation on how they could kidnap Sally at the end. Trust me, just a couple of sleeping pills doesn't make you weak as a baby. I also doubt the little creature would be strong enough to drag away an adult human.
Make it more clear exactly what they wanted with her, what happens to those taken, and if her grandfather was mong the three demons. Did she become a demon herself? In that case, show it, and make the demon look similar enough that we can see it's still her.
They said they wanted to be free. They already were free, but I guess they meant free to go wherever they wanted in the world, just not in and around the house. If so, how many humans do they need to join them (and how does becoming a demon makes them stronger) before they are finally free, and what are the rules?