To move on, one needs to accept these things when they happen. You don't have to like it, but for the sake of mental health and getting on with life, you have to accept it - (suck it up, as it were; take it like a man! ). I believe Elvis did this, and people aren't giving him enough credit.
Certainly, Elvis' life changed after Gladys died but I agree with you, JJ, that the link between Gladys dying and how Elvis' life actually ended is rather tenuous.