Well, Bo Dallas failed in WWE for many reasons. Bo Dallas was not one of the main characters in WWE storyline. WWE never promotes him. Regardless of that, Bo Dallas was one of the characters who remained as one of the characters who randomly appeared in WWE during certain times. WWE focused a lot on characters like Brock Lesnar, The Undertaker, John Cena, randy Orton, Kane, Vince McMahon, Seth Rollins, etc.