I kinda like him not being a champion. Its mostly because I get tired of seeing important figures become champions, while it totally makes sense as to why important figures become champions.
I feel like the appeal to Rafen isn't so much in his character but the fact that he is just some guy, hes not a deity, legendary warrior, monarch, he is just a regular Bilgewater man who's had his fair share of experiences.
Would I be upset to see him a champion? No, like I said his character is amazing and I would love more Bilgewater champions. But seeing him become a champion would kinda lose the appeal that this guy isn't a badass but rather a normal person with wants and needs.