At best, WWE's annual Youtube revenue is likely less than 3% of WWE's annual gross revenues, and will only decrease as a % overall with the new upcoming TV deals.
You could obviously emphasize that in any given year without Youtube revenues, in that same year and/or some future year(s), WWE would potentially have less annual profit or perhaps even a net annual loss. You could even focus on the fact that it's growing annually at a relatively higher rate than other revenue streams, increasing at an annual rate of at best 1% but likely less than 1% of WWE's total annual revenue going forward.
However, any company that is building its core product(s) around or relying on a revenue stream that is that small of a portion (3% or less) of its overall revenue, even if it's growing year over year (at best) at 1% of total revenues, especially at the potential expense or downfall of other larger proportional annual revenue streams, isn't necessarily looking at the big picture and is probably being incredibly mismanaged overall or in many other key areas.