If you're trying to make costs more affordable, inflation does a number of things over time to help with that. [Longer rant on how inflation is ultimately damaging omitted.] If TSN offers the same money when negotiations come up next time, it would be a more profitable deal than what Rogers talked itself into.
Put another way: this isn't where ABC/ESPN forked out 5 years, $600 million in 1999, quickly realized it had overpaid [not helped by burying the league on ESPN2 in non-prime slots], tried scooping up the rights going forward for about $60 million a year with no guarantee of prime-time or prime-network viewing, then Comcast/Versus paid just over half that in the next TV deal with NBC getting profit-sharing rights from the NHL.