There's already talk they are going to increase the price next year to $12.99/year.
They can get away with it if it coincides with them adding Raw and Smackdown replays immediately after airing. They could also take Wrestlemania off the network next year, add the Raw/Smackdown shows, and stay at 9.99 if they want to make more money.
The stock dropped like 15% yesterday when the sub number was announced- which is pretty bad!