Yes. Teach will not become PK. That's what Luffy will do. That being said Teach will still fight Luffy afterwards. Its not like BM just quit being a pirate after Roger conquered the grand line. Teach will aspire to higher goals than PK. He will be like Rocks and want to rule the world
The world government holds the history of the world.
Teach will not bear the history of the world.
Ergo he will not conquer the world.
Because Luffy beating Teach does not resolve the history of the world and the many crimes of the World Gov. that Roger / Joyboy are waiting for. It's just Luffy beating a powerful pirate who stands atop rubbles.