I think Lisa's children or even grandchildren will eventually sell Graceland. The only thing that connects them with Elvis, is their last name (and even that isn't completely rightfull, since they may choose for the last name of their father, instead of their mother).
Although I never have visited Graceland, I still hate the idea that Priscilla had it completely re-decorated before opening it to the public. The Graceland that we see and visit, isn't the same as the one Elvis lived in during the last few days of his life. Priscilla was given Graceland (through the Estate) and made it her own and tried to sell it as the true, real, authentic home of Elvis, completely time-sealed after August 1977.
I also believe that the first floor will be opened for public. Like the rest of Graceland, Lisa and Priscilla try to sell it with a taste of romance (and lies). They say the 1st floor is completely the same and still furnished. That's another lie: the first floor is empty and Lisa's old room is used as storage. SO their story is just a way of keeping the public curious and wanting to visit the 1st floor.