What really matters is cashflow. Forbes estimates GSW's operating income is about $75M. If GSW had to pay Curry and Durant $80 million each per year, they'd be running a deficit. If they paid Curry $80 Million per year, he'd be making more $$ than the owner. No league could tolerate a salary situation like that for long.
The flaw in this logic is the assumption that other salaries would stay the same.
With no cap Curry would make a heck of a lot more, and other players would make less, as the owners would cut salaries to break even.
What's out of whack in the current system isn't that Steph Curry gets a $200 million contract. It's that Jrue Holiday gets $126 million.
If you let the free market dictate salaries, what you would see is something more along the lines of what we all understand to be true, which is that an MVP candidate like Curry is worth something like 20 times what Jrue Holiday is worth, in terms of chance to win it all, ratings, TV dollars and ultimately franchise value.