Acting is about art, which brings up different issues and value. But looking at broadcast sports, the marginal value of doing that work is still zero: If that person didn't play football, someone else would and the entertainment benefit would be the same (excluding the few extraordinary athletes like Messi).
If there was some accountability those teams would be better or would be playing at a different level or not at all. So I'd argue pro/rel is a net plus because it leads to better play. Personally I watching the New York Red Bulls (Major League Soccer) play in person but overall soccer is the US is not up to international standards.
What blows my mind about soccer in the UK is that interest is so great that they can support two leagues below the Premier League and I know there are leagues below those. When I went to the Cornell/Syracuse game which is a legendary matchup that attracts a lot of youth players in the audience I was just thinking of the depth and width of the pyramid of soccer play from Kindergarten all the way to the world cup which is what makes the soccer universe so compelling. (Kinda wish more of us enjoyed college soccer!)
From a sports perspective, sure, I agree. I've often thought that the only non-competitive position on a sports team is owner. If anyone else, coach or player, performed for one year like the some team owners do for decades, they'd be out of a job. Owners won't agree to losing their jobs (fire the bottom 5%?), but relegation ... but would the other owners want the biggest market, for example, relegated?
But this discussion is about societal value. Whoever wins and loses, every game is net zero in entertainment value (whatever that is worth): 1 win and 1 loss. Every relegation is net zero: one team promoted, one relegated. Every championship: 1 team wins, another finishes 2nd, etc., no matter who it is.