More like Ryoma finally activates PoP to use against his dad, only to get owned into oblivion when his dad tells him that the PoP is actually just a stepping stone to the 12 hidden gates of tennis, which he needs to unlock to beat the world's best. Now, Echizen needs to travel around the world to beat the guardians of these doors to reach the final 13th gate, which no one has ever reached.
By then, the world would have been destroyed by tennis players. Lol. Especially when all the Jr. High students find out about these new gates and begin to open them. Bye bye, Earth.