I dont think so, facebook launches their own cryptocurrency and the impact was huge there are problems they are facing right now. But even though they will launch, they will never defeat bitcoin in terms of popularity of usage. Even if google created their own, they will not defeat bitcoin so easily. The one thing people wants with bitcoin that other cryptocurrency doesnt have is a real decentralized model. People already learn, they dont want a single entity to rule the world. And to take note that the transparency between transaction was there. And the most important thing is the fair distribution, other cryptocurrency always have a premine for the team.