You're right: there are so many rumors about Elvis. And yes, some (?) of them are so ridiculous... But well, it was supposed to happen because of the level of icon Elvis is. Don't you think so?
I guess music had a marvelous improvement after "the king's" arrival to that world. Not only rock'n'roll, but gospel, country, blues... Even clothing style and other environments too were modify because of the influence of our man.
Elvis left a deep mark in people hearts. New generations of fans are being created. That's a prove of the impact that still (and till the end of time )