Local media reports that Prince Georges County has various proposals to fix the problems, but may not have the money without appropriation from the state of Maryland/ It's possible to build a temporary water main that would not survive the winter. There are disagreements as to the legal responsibility for the integrity of the slope. It's possible that some residents can be out for six months, and that some homes could be razed. There is talk that the County could possibly buy back the land and homes from some residents.
The story shows how easy it is for a homeowner to become vulnerable and possibly homeless if not anticipating the problems in an area.
I was in the North Shore of Long Island, near Great Neck, on June 30, and I could see how low many homes are built; even the north side (away from the Ocean) could become vulnerable to sea level rise and storm surge.
Update: January 18, 2016
On MKK Day, I drove down Piscataway Drive, and it looks like the slope has been repaired and everything is back to normal. Who paid for the repairs and damage? I don't see much news on it or much on it. If you know, comment. The scenery is spectacular, almost like the California coast, with wintry vegetation.