Well, in our case, we just had to move to a smaller house. Two bedrooms, but one is downstairs and one up. I don't want that much distance between us and our daughter at night, so for now we've put her bed down in our room, and she loves it. She sleeps better now than she ever did.
Now, when we move into a bigger house again, I don't know what will happen. But hopefully she will be big enough by then to realize that we have not left her just because she's going to sleep.