I think Elvis would still be selling records had Graceland not been opened and Elvis is a phenomenen unlike anything the world has previously known. He is timeless. Its very hard to comapre his legacy to anyone Elvis, as no one comes close.
Graceland had to be opened to the public as there wasn't going to be enough money for them to keep the house had they not. Graceland would have ahd to be sold had it not been opened up, Elvis left hardly any money when he died and it was just a mtetr of economics to open up the house.
Sony/BMG handle his records....not cilla and in my opinion untill recently have handled them very poorly.