As opposed to spending money on a summer holiday?
Why more income? The only reports I have ever read about summer football showed that the crowd size didn't change. The only difference for the telly is that SPL games would be shuffled around the schedule so the Olympics/Cricket/Boat Race could be shown.
And there is no way any English club who had just finished a season would loan out any knackered player for more the summer.
The easiest way to improve football for the fans is bring back standing and kick off at 3pm every Saturday. That's too easy for the authorities, however, so they are looking at everything but that.