DH will never achieve mainstream viewership. It's more boring than baseball if you're not a dedicated fan. Anyone who tells you DH is about to "break through" is selling you a bridge. The Rampage broadcast could achieve mainstream viewership in theory, but the way they broadcast it live is SOOOOOO long and boring, and it's a just once-a-year event which makes it hard for people to attach to. As it sits, watching a live Rampage broadcast is a mix of boredom, white hot panic, and frustration.