You're correct that the overseas revenue stream will increase the total income, however the clear domestic decrease shouldn't be dismissed.They will sell for near enough reserve price eventually
Overseas deal will bring the total to more than last deal.
It seems to me that Sky and BT have come to an agreement between them to keep prices and packages the same.
They now share content as well
Unless the likes of Amazon, Netflix or Facebook come in with a competitive offer, then I feel that the final two tranches may have a lower value.
BSkyb and BT's "disciplined approach" (their words) is already obvious and without competitive bids I'm sure they'll argue for less £ per game.
I remember when the previous deals were signed an expert on 5Live predicted there'd be stagnation in this deal and an eventual plateau or decline.