I think non loving footballers will become more and more of a thing. You can see from the academy programmes on telly that have been made, so many of them are there because they’ve been drilled from before they’ve gone to school. Some dont catch the bug for the game by watching it because their parents and coaches are too busy drilling them in the wind and rain to play it. They never have that moment where they fall in love with it.
I think most do love the game at some point, or at least really liked it. I don't think it's possible to reach the top levels if you don't somewhat tbh, due to sheer amount of hours you'd be playing it to reach that level. You simply eoukd do other stuff more and therefore not meet standard to become a pro. I doubt many 13 year olds who are extremely takented at football are thinking I hate football, but it's a good career track for me.
I definitely think people would lose passion, love as time goes on though. Maybe as you get exposed to different elements over time whether it's fans abusing you/your family, cut throat cold financial side involving clubs, agents, sponsors, etc that coukd such joy out of it. Or strict diets, training regimes as game becomes more professional and science/analytical based compared to playing with your mates for hours each day in the summer holidays. Encouraged to cheat , feign injury to gain advantages over opponents where possible.
Whole thing becomes more and more removed from why you loved it as a kid.
Also parallels with business, where people say if you start a business about something you love/passionate about, there's a good chance you're attitude will change towards it when it's no longer a a hobby, passion but something you rely on for income.
Of course there's much worse ways to make a living, but just saying I can empathise with players or people in any line of work that lose love, enthusiasm over time for their industry regardless of how well paid they are.