Mayweather says his last fight is Sept 2015

[Ron Swanson]

HBO and Showtime had to join forces for Tyson v Lewis so it can be done :-)

That sounds easy in theory but some things have changed. Back then HBO was boxing. And HBO had way more subscribers. HBO still has more subscribers but Showtime has been gaining ground fast. It's easy to work with a company that isn't a threat to you and has a commodity(Tyson) you want to use. It's a little different when the company with the commodity(Floyd) is a genuine threat.
HBO and Showtime have gotten so close in who's the top channel for boxing that the people that spread misinformation are desperately pointing to ratings.(as if that's an indicator of success to a subscription channel haha)

[smashup]

HBO and Showtime had to join forces for Tyson v Lewis so it can be done :-)

That sounds easy in theory but some things have changed. Back then HBO was boxing. And HBO had way more subscribers. HBO still has more subscribers but Showtime has been gaining ground fast. It's easy to work with a company that isn't a threat to you and has a commodity(Tyson) you want to use. It's a little different when the company with the commodity(Floyd) is a genuine threat.
HBO and Showtime have gotten so close in who's the top channel for boxing that the people that spread misinformation are desperately pointing to ratings.(as if that's an indicator of success to a subscription channel haha)

But if its Floyds last fight on his Showtime deal there isn't any future threat.

It'd just be a one off