It was this accident that drastically changed the world of rock and roll. Music became a lot more bland (even Elvis started to sing a lot of non-rock music in the early 1960’s) until the Beatles began the second wave of rock and roll in 1963 and 1964.
To be fair, a lot of Elvis’ country and gospel from that era is really amazing stuff. I don’t think he was going “bland”, just rediscovering a lot of his musical roots.