Movies wouldn't cost 100 million because the people who work on them are following the same principle as the guy who writes the screenplay for nothing. If a town wants a movie theater or sports arena then they build it together and the people who know what they're doing manage the construction. If they don't want to spend the year or 2 constructing it then they don't want it bad enough. Once it's complete it pays for itself since nobody in the town will have to pay admission and can use the facility as they please.
Dirty jobs should be shared equally on a schedule, voted on by everyone in the town/restaurant/factories. At least until robotics and AI are advanced enough to do those jobs for us.
Like you said before this is fantasy in the sense that this wouldn't fly in this day and age but it will eventually. I think it makes more sense and is more ethical than $140 million contracts for a guy who can hit a ball with a stick really well. There is reward and then there's gross irresponsible excess.
They don't have to play it if they don't want to. I'm okay with trading professional sports in favor of heating, education, public transportation etc. People can still play at a park if they want to.
Sports wouldn't go away though, when people love something they do it. Do you think these guys gave a shit about a $1million contract waiting for them after high school/college?
https://en.wikipedia.org/wiki/1869_New_Jersey_vs._Rutgers_football_game