I'd suggest the opposite. Casual viewers are much more likely to be interested in entertainment above sporting purity. And controversy brings entertainment. I shouldn't be surprised if a number of those tuned in this year just to see what the next episode will bring
I don't think that's quite true. Sure some will prefer the entertainment side but I think a lot value purity because it's the unscripted nature and level playing field which is so watchable.
I've said it before but just look at all the eSports growth, as level a playing field as you can imagine. They could easily code in "controversy" and luck but that would be hated.
It's quite easy to paint the younger generations as quite shallow but often such opinions are based on the noisy few rather than the quiet majority.