system
Given the following post, respond as if you're commenting on Reddit:
human
[In Time] What sort of impact would the 'time' have on sport?

I was thinking about this and it occurred to me that if you are a world class sportsman in a sport like football (soccer) or basketball, then you can basically be world class forever if you don't have a career ending injury or mental breakdown.

Would this lead to less interest in the sport? It might get stale if you're watching many of the same people every year. Or would it lead to more interest? The highest quality players always around, legends V legends always in their prime. 

Would it lead to more leagues and teams because retirements are far less frequent? 

Might they impose a mandatory retirement/extended leave period to keep things from getting stale?
gpt
The turnover would be lower, you're right in that. The quality would also be higher as there would be less new and inexperienced players on the field.  

On the other hand, as high-end players are paid much more than day-at-a-time, there would be player turnover as players would move to living from their investments instead from their game salaries.