....Eventually, you won't be able to pay the salaries of 6 very skilled players.
I think we are a long way off this stage of the game and I would expect some of the top teams to be selling out 20k plus stadiums by then (sooner) which should provide 500k a week not including cup money and TV money.... I think a decent PR guy will offset the majority of staff costs and so you would need a seriously kick arse line up to be losing money each week!